Floating projection device

Abstract

The invention discloses a floating projection device. The floating projection device comprises a mirror structure, an optical structure, an optical coating film and a display, the optical structure covers the mirror structure, and an accommodating space is formed between the optical structure and the mirror structure. The optical coating film is disposed on the optical structure. The display is arranged in an accommodating space formed between the optical structure and the mirror structure and is used for sending a plurality of image light beams to the optical structure.

Description

Technical Field

[0001] The invention relates to a floating projection device, and in particular to a floating projection device capable of improving display effects. Background Art

[0002] In the prior art, the floating projection device is formed by overlapping two concave mirror structures, and forming an opening in the center of the upper mirror structure. A real object is set in the floating projection device. The image of the real object can be reflected multiple times in the floating projection device, and penetrate the opening in the center of the upper mirror structure to form a display image close to the real object above the floating projection device.

[0003] In the above-mentioned prior art floating projection device, the viewing angle of the displayed image is limited to a certain extent. Moreover, when the user observes the displayed image from above, it is easy to observe the real object inside the floating projection device from its opening at the same time, which causes visual interference. Summary of the invention

[0004] The present invention is directed to a floating projection device, which can effectively improve the display effect.

[0005] According to an embodiment of the present invention, a floating projection device includes a mirror structure, an optical structure, an optical coating, and a display. The optical structure covers the mirror structure and forms a housing space with the mirror structure. The optical coating is disposed on the optical structure. The display is disposed in the housing space formed between the optical structure and the mirror structure, and is used to send a plurality of image beams toward the optical structure.

[0006] Based on the above, the floating projection device of the present invention is provided with an optical coating on the upper optical structure. The optical coating can reflect or transmit the image beam according to the polarization direction of the light beam, and enable the display image to be formed above the floating projection device. In this way, the viewing angle of the display image generated by the floating projection device can be greatly improved, effectively improving the quality of the display image. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A schematic diagram of a floating projection device according to an embodiment of the present invention;

[0008] Figure 2 A schematic diagram of an imaging method of a floating projection device according to an embodiment of the present invention;

[0009] Figure 3 A schematic diagram of the traveling details of the image light beam of the floating projection device according to an embodiment of the present invention;

[0010] Figure 4 A schematic diagram of the imaging distance of the floating projection device according to an embodiment of the present invention;

[0011] Figure 5A A schematic diagram of a floating projection device according to an embodiment of the present invention;

[0012] Figure 5B for Figure 5A A schematic diagram of the path of the image beam of the floating projection device 500;

[0013] Fig. 6A A schematic diagram of a floating projection device according to an embodiment of the present invention;

[0014] Figure 6B for Fig. 6A Schematic diagram of the traveling path of the image light beam of the floating projection device 600. DETAILED DESCRIPTION

[0015] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0016] Please refer to Figure 1 , Figure 1 A schematic diagram of a floating projection device according to an embodiment of the present invention is shown. The floating projection device 100 includes a mirror structure 110, an optical structure 120, an optical coating 130, and a display 140. In the present embodiment, the optical structure 120 is disposed above the mirror structure 110. The optical structure 120 covers the mirror structure 110 and forms a housing space Z1 between the optical structure 120 and the mirror structure 120. The optical coating 130 is disposed on the optical structure 120. The optical coating 130 is disposed on the inner surface SI of the optical structure 120 facing the mirror structure 110. The display 140 is disposed in the housing space Z1. The display 140 is used to send a plurality of image light beams IMB toward the optical structure 120.

[0017] In this embodiment, the optical coating 130 includes a phase delay film layer and a polarization selective reflective film layer. The polarization selective reflective film layer is disposed between the phase delay film layer and the inner surface SI of the mirror structure 110. The phase delay film layer can change the polarization state of the received light beam, and the polarization selective reflective film layer is disposed to selectively reflect or transmit the received light beam according to the polarization state of the received light beam.

[0018] In this embodiment, the image beam IMB sent by the display 140 may be reflected multiple times and transmitted once in the mirror structure 110 and the optical coating 130, and form a real image display image on the imaging plane IMP adjacent to the outer surface SO of the optical structure 120 outside the accommodating space Z1 formed between the optical structure 120 and the mirror structure 120.

[0019] Through the above-mentioned imaging method, a display image that can be seen from different angles and is close to a real object can be generated, which can be called a hologram.

[0020] In the present embodiment, the optical structure 120 may be a transparent structure. In addition, in the present embodiment, the mirror structure 110 and the optical structure 120 may both be concave structures, and the concave surface of the mirror structure 110 and the concave surface of the optical structure 120 may face each other. The mirror structure 110 and the optical structure 120 may have a first radius of curvature and a second radius of curvature, respectively, wherein the first radius of curvature and the second radius of curvature are real numbers other than 0. In addition, the display 140 may be a liquid crystal display.

[0021] Regarding the light beam travel path of the embodiment of the present invention, please refer to Figure 2 A schematic diagram showing an imaging method of a floating projection device according to an embodiment of the present invention. Figure 2 In the embodiment, the display 140 can send image beams IMB1 and IMB2 toward the optical coating 130. The optical coating 130 can reflect the image beams IMB1 and IMB2 and generate reflected beams RB11 and RB21 respectively. The reflected beams RB11 and RB21 advance toward the mirror structure 110. The mirror structure 110 is used to reflect the beams RB11 and RB21 to generate reflected beams RB12 and RB22 respectively.

[0022] Then, the reflected light beams RB12 and RB22 may pass through the optical coating 130 and the optical structure 120 , and may generate a display image outside the accommodating space Z1 .

[0023] For further explanation, please refer to Figure 3 A schematic diagram showing the details of the travel of an image beam of a floating projection device according to an embodiment of the present invention is shown. In this embodiment, the image beam IMB generated by the display is a circularly polarized light of a first hand direction, and the first hand direction is, for example, right hand. When the image beam IMB is transmitted to the phase delay film layer QWP, the phase delay film layer QWP can convert the image beam IMB into a linearly polarized light of a first direction, and the first direction is, for example, a vertical direction. In this embodiment, the phase delay film layer QWP can be a 1 / 4 delay plate.

[0024] Next, the polarization selective reflective film layer IQPS can receive the vertical linear polarized image beam IMB and selectively reflect the image beam IMB to generate a reflected beam RB1. The reflected beam RB1 can pass through the phase delay film layer QWP, which converts the reflected beam RB1 into right-handed circular polarized light.

[0025] The reflected light beam RB1, which is a right-handed circularly polarized light, can be transmitted to the reflective surface of the mirror structure 310. The mirror structure 310 is used to reflect the reflected light beam RB1 and generate a reflected light beam RB2. The reflected light beam RB2 is a circularly polarized light of a second hand direction (left hand). Then, the reflected light beam RB2 can pass through the phase delay film layer QWP, and the phase delay film layer QWP converts the reflected light beam RB2 into a linearly polarized light of a second direction, and the second direction is, for example, a horizontal direction.

[0026] The reflected light beam RB2 which is a horizontal linear polarized light can be transmitted to the polarization selective reflective film layer IQPS. Moreover, the polarization selective reflective film layer IQPS can transmit the reflected light beam RB2 and make the reflected light beam RB2 form a display image on the imaging plane IMP.

[0027] For the calculation of the imaging distance of the floating projection device in the embodiment of the present invention, please refer to Figure 4 Schematic diagram of imaging distance of a floating projection device according to an embodiment of the present invention is shown. In this embodiment, the mirror structure 410 and the optical structure 420 in the floating projection device 400 are both concave structures, and have curvature radii R2 and R1, respectively. The vertical distance between the mirror structure 410 and the imaging plane IMP is L (image distance), and the vertical distance between the mirror structure 410 and the optical coating 430 is A. According to Formula 1:

[0028]

[0029] We can obtain relation 1: At this time, A is positive, R1 is negative, and R2 is positive, wherein I1 is the image distance of a single image, and FR1 is the focal length of the optical structure 420 .

[0030] According to equation 1, the image distance of a single image can be calculated:

[0031] Then, according to the image distance I1 of the primary imaging, the image distance of the secondary imaging can be further calculated. in According to the requirements of floating projection, the image distance L needs to be greater than the distance A. Therefore, in design, the mirror structure 410 with a suitable curvature radius R2 and the optical structure 420 with a curvature radius R1 can be selected, and the floating projection device 400 can effectively generate a display image as a holographic image.

[0032] Please refer to Figure 5A as well as Figure 5B ,in Figure 5A A schematic diagram showing a floating projection device according to an embodiment of the present invention is shown. Figure 5B Show Figure 5A A schematic diagram of the path of the image beam of the floating projection device 500. Figure 5A In the embodiment, the floating projection device 500 includes a mirror structure 510, an optical structure 520, an optical coating 530 and a display 540. Figure 1 In different embodiments, in this embodiment, the mirror structure 510 may be a planar structure, and the optical structure 520 and the optical coating 530 may be concave structures, and the concave surfaces formed by the optical structure 520 and the optical coating 530 face the reflective surface of the mirror structure 510 .

[0033] exist Figure 5B In the embodiment, the image beam generated by the display 540 can be reflected multiple times and transmitted once between the optical coating 530 and the mirror structure 510, and form a display image on the imaging plane IMP. In this embodiment, the optical coating 530 in the floating projection device 500 has a curvature radius R1. The vertical distance between the mirror structure 510 and the imaging plane IMP is L (image distance), and the vertical distance between the mirror structure 510 and the optical coating 530 is A. According to the above formula 1, the relationship 2 can be obtained: Where I1 is the image distance of a single image, and FR1 is the focal length of the optical coating 530. It can be further deduced that in At this time, A is positive and R1 is negative

[0034] From the above derivation, it can be known that the imaging distance of the optical coating 530 is equal to AP. In order to achieve the floating requirement of the displayed image, the imaging of the optical coating 530 can be generated above the optical structure 520 through the reflection action of the mirror structure 510. Therefore, the imaging distance of the optical coating 530 needs to be greater than 2A. Since the displayed image generated in this case is a real image, the distance A needs to be greater than half of the curvature radius R1. Combining the above factors, the relationship 3 can be derived:

[0035] That is, by selecting the curvature radius R1 of the optical coating 530 that meets the above relationship, the floating projection device 500 can effectively generate a display image that is a holographic image.

[0036] Please refer to Fig. 6A as well as Figure 6B ,in Fig. 6A A schematic diagram showing a floating projection device according to an embodiment of the present invention is shown. Figure 6B Show Fig. 6A A schematic diagram of the path of the image beam of the floating projection device 600. Fig. 6A In the embodiment, the floating projection device 600 includes a mirror structure 610, an optical structure 620, an optical coating 630, and a display 640. Figure 1In different embodiments, in this embodiment, the mirror structure 610 may be a concave structure, and the optical structure 620 and the optical coating 630 may be planar structures, and the concave surface formed by the mirror structure 610 may face the optical structure 620 and the optical coating 630 .

[0037] exist Figure 6B In the embodiment, the image beam generated by the display 640 can be reflected multiple times and transmitted once between the optical coating 630 and the mirror structure 610, and form a display image on the imaging plane IMP. In this embodiment, the mirror structure 610 in the floating projection device 600 has a curvature radius R2. The vertical distance between the mirror structure 610 and the imaging plane IMP is L (image distance), and the vertical distance between the mirror structure 610 and the optical coating 630 is A. According to the above formula 1, the relationship 4 can be obtained: Where I1 is the image distance of a single image, and FR2 is the focal length of the mirror structure 610. It can be further deduced that At this time, A is negative and R2 is positive

[0038] To achieve the floating requirement of the displayed image, the image distance I1 of the primary image must be greater than the distance A. Since the displayed image generated in this case is a real image, the distance A must be greater than one-fourth of the curvature radius R2. Combining the above factors, the relationship 5 can be derived:

[0039] That is, by selecting the curvature radius R2 of the mirror structure 610 that meets the above relationship, the floating projection device 600 can effectively generate a display image that is a holographic image.

[0040] In summary, the floating projection device of the present invention has a mirror structure and an optical structure that are arranged accordingly. By means of an optical coating arranged on the optical structure, the image beam generated by the display can be reflected multiple times between the optical coating and the optical structure to convert the polarization state of the image beam. The optical coating transmits the image beam with a specific polarization state to the top of the floating projection device, and a holographic image can be generated above the floating projection device. In this way, the display image generated by the floating projection device can have a relatively wide viewing angle, and the user will not directly see the image beam generated by the display, which can effectively avoid the occurrence of visual interference.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A floating projection device, comprising: Mirror structure; An optical structure, covering the mirror structure and forming an accommodation space between the optical structure and the mirror structure; An optical coating, disposed on the optical structure; as well as The display is arranged in the accommodation space formed between the optical structure and the mirror structure, and is used for sending a plurality of image light beams toward the optical structure.

2. The floating projection device according to claim 1, wherein the optical coating is disposed on an inner surface of the optical structure facing the mirror structure. 3 . The floating projection device according to claim 1 , wherein the optical coating comprises a phase delay film layer and a polarization selective reflective film layer. 4 . The floating projection device according to claim 3 , wherein the polarization selective reflective film layer is disposed between the inner surface of the mirror structure and the phase delay film layer.

5. The floating projection device according to claim 3, wherein the multiple image light beams are reflected for the first time on the inner surface of the optical structure and generate multiple first reflected light beams, the multiple first reflected light beams are reflected for the second time on the reflective surface of the mirror structure and generate multiple second reflected light beams, and the multiple second reflected light beams transmit the inner surface of the optical structure and form a display image that is a real image.

6. The floating projection device according to claim 3, wherein the display projects the multiple image light beams as circularly polarized light of a first rotation direction, the phase delay film layer converts the multiple image light beams into linearly polarized light of a first direction, the polarization selective reflective film layer reflects the multiple image light beams as linearly polarized light of the first direction to generate the multiple first reflected light beams, and the phase delay film layer further converts the multiple first reflected light beams into circularly polarized light of the first rotation direction. 7 . The floating projection device according to claim 6 , wherein the reflective surface of the mirror structure reflects the plurality of first reflected light beams to generate the plurality of second reflected light beams which are circularly polarized light of a second hand direction.

8. The floating projection device according to claim 7, wherein the phase delay film layer converts the plurality of second reflected light beams into linearly polarized light in a second direction, and the polarization selective reflective film layer transmits the plurality of second reflected light beams as linearly polarized light in the second direction. 9 . The floating projection device according to claim 4 , wherein the display image is formed outside the accommodating space and adjacent to an outer surface of the optical structure. 10 . The floating projection device according to claim 1 , wherein the mirror structure and the optical structure have a first radius of curvature and a second radius of curvature respectively, and the first radius of curvature and the second radius of curvature are non-zero real numbers. 11 . The floating projection device according to claim 10 , wherein the concave surface of the mirror structure and the concave surface of the optical structure face each other.

12. The floating projection device according to claim 1, wherein one of the mirror structure and the optical structure is a planar structure, and the other of the mirror structure and the optical structure has a constant curvature radius, and the curvature radius is a real number other than 0. The floating projection device according to claim 1 , wherein the optical structure is a transparent structure.

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