Desktop type suspension display system and design method

Abstract

The invention relates to a desktop type suspension display system and a design method, the desktop type suspension display system comprises a display source, a curved surface reflector and a light splitting flat plate, the display source and the curved surface reflector are arranged below the light splitting flat plate, the display source and the curved surface reflector are oppositely arranged, an included angle # imgabs0 # is arranged between the display source and the vertical direction, and the included angle # imgabs0 # is arranged below the light splitting flat plate. An included angle # imgabs 1 # is formed between the curved-surface reflecting mirror and the vertical direction, and an included angle # imgabs 2 # is formed between the light splitting flat plate and the horizontal direction; the display source is used for projecting an image, an included angle # imgabs3 # is formed between a principal ray projected by the display source and a plane normal of the display source, light emitted by the display source firstly reaches the light splitting flat plate, then part of the light is reflected to the curved-surface reflecting mirror by the light splitting flat plate, is reflected at the curved-surface reflecting mirror, reaches the light splitting flat plate again and penetrates through the light splitting flat plate, and the light emitted by the display source is reflected by the curved-surface reflecting mirror. Generating a suspension image in the space; through the design method of the desktop type suspension display system, a suspension image is vertical to the horizontal direction to form a standing image.

Description

Technical Field

[0001] The present invention relates to the field of spatial imaging technology, and particularly relates to a desktop floating display system and a design method thereof. Background Art

[0002] All along, due to its unique spatial imaging effect, the floating display technology has great development potential and broad application prospects in the fields of commercial display, education and training, medical treatment, and entertainment. In the prior art, the imaging of the floating display system depends on a complex optical path design. Limited by technical capabilities and system architecture, the existing devices that rely on beam splitters and curved mirrors to achieve floating display have the following problems: 1. The beam splitters of the existing optical systems that rely on beam splitters and curved mirrors to achieve floating display need to be placed at an angle of 45° to the horizontal direction to make the displayed image perpendicular to the ground, so a desktop floating display cannot be achieved. In addition, the hardware device will be directly exposed in the user's field of vision, weakening the display effect of the floating image and affecting the user's viewing experience. Such as the floating display devices disclosed in patent documents CN118655716, CN219676388U, and CN219676388U.

[0003] 2. If the existing optical system that relies on beam splitters and curved mirrors to achieve floating display wants to achieve a desktop floating display, usually the whole system is rotated so that the beam splitter changes from an inclined angle of 45° to 0°. Then the finally generated floating image cannot be perpendicular to the ground and will have an inclined angle of 45° with the ground, which cannot meet the display effect expected by users. Summary of the Invention

[0004] In order to solve the problem that the images generated by the existing floating display devices cannot be perpendicular to the ground, thus affecting the display effect, the present invention proposes a desktop floating display system and a design method to generate a floating image perpendicular to the ground, which is convenient for hiding the device and meets the spatial constraints and interaction requirements of the desktop application scenario.

[0005] To achieve the above object, the first aspect of the present invention proposes a desktop floating display system, including a display source, a curved mirror, and a beam splitting flat plate. The display source and the curved mirror are arranged below the beam splitting flat plate, and the display source and the curved mirror are arranged opposite to each other. An included angle is provided between the display source and the vertical direction θ1 and an included angle is provided between the curved mirror and the vertical direction θ2 and an included angle is provided between the beam splitting flat plate and the horizontal direction θ3 ; The display source is used to project an image, and an included angle is provided between the main light ray projected by the display source and the plane normal of the display source α, the light emitted from the display source first reaches the beam-splitting flat plate, and then the beam-splitting flat plate reflects part of the light to the curved mirror, and the reflection occurs at the curved mirror, and then it reaches the beam-splitting flat plate again and passes through the beam-splitting flat plate to generate a floating image in space; The incident angle of the chief ray on the curved mirror is β , and there is an included angle between the floating image and the chief ray θ4 ; The included angle θ3 ranges from 0° ≤ θ3 ≤ 30° ; When θ4 + 2 * θ2 + 2 * θ3 - θ1 - α = 90° , the floating image is perpendicular to the horizontal direction to form a standing image.

[0006] The function of the display source is to provide the display content; the function of the curved mirror is to modulate the light from the display source to generate a floating image; the function of the beam-splitting flat plate is to reflect the light from the display source and transmit the light from the curved mirror.

[0007] Furthermore, it includes a beam-splitting flat plate, multiple display sources and a combination of a curved mirror.

[0008] Furthermore, it includes a beam-splitting flat plate, multiple display sources and multiple combinations of curved mirrors.

[0009] The floating display system can be one display source paired with one curved mirror, or multiple display sources paired with one curved mirror, or multiple display sources paired with multiple curved mirrors. This flexible configuration method can meet the requirements in different scenarios and achieve multi-screen overlay display or the construction of complex scenarios.

[0010] The second aspect of the present invention proposes a design method for a desktop floating display system, which is used to design a desktop floating display system, including: Step 1: Obtain the distance from the center of the display source to the beam-splitting flat plate d1 , obtain the distance from the curved mirror to the beam-splitting flat plate d2 , according to d1 and d2 and the included angle α calculate the effective imaging distance from the display source to the curved mirror d12 ; Step 2: Measure the included angle θ1 , the included angle θ2 , the included angle θ3 and the included angle α calculate the incident angle β ; Step 3: According to the included angle θ1 , the included angle θ2 , the included angle θ3 and the included angle α and the effective imaging distance d12Focal length of the curved mirror F Calculate the included angle θ4 , satisfying θ4 + 2 * θ2 + 2 * θ3 - θ1 - α = 90° ; Step 4: According to the width of the display source l , effective imaging distance d12 , focal length of the curved mirror F , incident angle β and included angle α calculate the proportionality coefficient, and adjust the width of the standing image according to the proportionality coefficient η ; H ; Step 5: According to the width of the standing image H , width of the display source l , d2 , effective imaging distance d12 , included angle θ2 , included angle α , incident angle β calculate the height from the center of the standing image to the plane where the center of the beam splitting plate is located d3 to ensure the projection effect of the standing image.

[0011] Furthermore, the imaging distance described in Step 1 d12 is as shown in formula (1): d12 = (d1 + d2) / sin(θ1 + α) (1).

[0012] Furthermore, the incident angle described in Step 2 β is as shown in formula (2): β = θ2 + 2 * θ3 - θ1 - α (2).

[0013] Furthermore, the included angle described in Step 3 θ4 is as shown in formula (3): θ4 = arctan[(d12 * cosβ - F) / (F * tanα)] (3).

[0014] Solve each parameter through trigonometric functions and optical formulas, so that the desktop floating display system can generate a standing image.

[0015] Furthermore, the proportionality coefficient described in Step 4 η is as shown in formula (4): η = 4F(d12 * cosβ - F)cosα / {[(2 * d12 - l * sinα)cosβ - 2 * F] * [(2 * d12 + l * sinα)cos β - 2 * F]sinθ4} (4); The width of the standing image H is as shown in formula (5): H = η * l (5).

[0016] Furthermore, the height from the center of the standing image described in Step 5 to the plane where the center of the beam splitting plate is locatedd3 As shown in formula (6): d3 = [d12 * F * cos(π / 2 - θ2 - β) / (d12 * cosβ - F)] - d2+{l * F * cosα / [(2 * d12 - l * sinα)cosβ - 2 * F ]} -（H / 2） (6).

[0017] By using formulas (4) to (6) to adjust the length and width of the standing image, it adapts to different display requirements.

[0018] Through the above technical solution, the beneficial effects of the present invention are as follows: 1. The present invention realizes the display of the standing image, and the standing image is perpendicular to the horizontal direction, improving the display effect. The display source and the curved mirror are shown below the beam splitting plate, and there is an included angle between the display source and the vertical direction θ1 , and there is an included angle between the curved mirror and the vertical direction θ2 , and there is an included angle between the beam splitting plate and the horizontal direction θ3 , and there is an included angle between the main light ray projected by the display source and the plane normal of the display source α , the incident angle of the main light ray on the curved mirror is β , and there is an included angle between the floating image and the main light ray θ4 , when θ4 + 2 * θ2 + 2 * θ3 - θ1 - α = 90° , the floating image is perpendicular to the horizontal direction to form a standing image. The image light starts from the display source, first reaches the lower surface of the beam splitting plate and is reflected, then reaches the curved mirror, and after being reflected by the curved mirror, it passes through the beam splitting plate. Finally, the observer can see the standing and floating image above the display system, realizing the hidden desktop floating display. The floating image is perpendicular to the horizontal direction to form a standing image.

[0019] 2. The present invention realizes the design of the desktop floating display system. Through formulas (1) to (6), the mathematical correlations of various optical parameters ( θ1 ~ θ4、 α , β , d1 , d2 , F , d12 ) are established to ensure that the floating image strictly meets the vertical condition, eliminating the problem of image tilt in the traditional system in principle.

[0020] It provides a complete mathematical calculation model. Designers only need to input the basic parameters of the system according to the formula to quickly and accurately calculate other key parameters, greatly simplifying the design process. It does not require complex optical simulation equipment and a long testing process, reducing the skill threshold requirements for professional optical designers, reducing the human, material and time costs in the design process, improving the design efficiency, and contributing to the wide application of the desktop floating display system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 One of the schematic structural diagrams of a desktop floating display system according to the present invention; Figure 2 is Figure 1 operating principle diagram; Figure 3 Two of the schematic structural diagrams of a desktop floating display system according to the present invention; Figure 4 is Figure 3 operating principle diagram; Figure 5 Three of the schematic structural diagrams of a desktop floating display system according to the present invention; Figure 6 is Figure 5 operating principle diagram; Figure 7 Four of the schematic structural diagrams of a desktop floating display system according to the present invention; Figure 8 Flow chart of the steps of the design method of a desktop floating display system according to the present invention.

[0022] Reference numerals in the drawings: 1 is a display source, 2 is a curved mirror, 3 is a beam splitting plate, and 4 is a standing image. Detailed implementation mode

[0023] Example 1 As Figures 1 - 8 shown, a desktop floating display system includes a display source 1, a curved mirror 2, and a beam splitting plate 3. The display source 1 and the curved mirror 2 are arranged below the beam splitting plate 3, and the display source 1 and the curved mirror 2 are arranged opposite to each other. An angle θ1 is provided between the display source 1 and the vertical direction, and an angle θ2 is provided between the curved mirror 2 and the vertical direction. An angle θ3 is provided between the beam splitting plate 3 and the horizontal direction; The display source 1 is used to project an image. An angle α is provided between the main light ray projected by the display source 1 and the plane normal of the display source 1. The light emitted from the display source 1 first reaches the beam splitting plate 3, and then the beam splitting plate 3 reflects part of the light to the curved mirror 2, and reflection occurs at the curved mirror 2, and then it reaches the beam splitting plate 3 again and passes through the beam splitting plate 3 to generate a floating image in space; The incident angle of the main light ray on the curved mirror 2 is β , and an angle θ4 exists between the floating image and the main light ray; The range of the angle θ3 is 0° ≤ θ3 ≤ 30° ; When θ4 + 2 * θ2 + 2 * θ3 - θ1 - α = 90°, the floating image is perpendicular to the horizontal direction to form a standing image 4.

[0024] A desktop floating display system includes a beam splitting flat plate 3, a plurality of display sources 1 and a combination of a curved mirror 2.

[0025] A desktop floating display system includes a beam splitting flat plate 3, a plurality of display sources 1 and a combination of a plurality of curved mirrors 2.

[0026] The surface shape of the curved mirror 2 is not fixed, and can be a spherical surface, an aspherical surface or a free-form surface, and can have a certain off-axis amount.

[0027] The beam splitting flat plate 3 has a certain beam splitting ratio, can transmit a part of light and reflect a part of light, and its function is to reflect the light from the display source 1 and transmit the light from the curved mirror 2.

[0028] A design method for a desktop floating display system for designing a desktop floating display system, including: Step 1: Obtain the distance from the center of the display source 1 to the beam splitting flat plate 3 d1 , obtain the distance from the curved mirror 2 to the beam splitting flat plate 3 d2 , according to d1 and d2 and the included angle α calculate the effective imaging distance from the display source 1 to the curved mirror 2 d12 ; Step 2: Measure the included angle θ1 , the included angle θ2 , the included angle θ3 and the included angle α calculate the incident angle β ; Step 3: According to the included angle θ1 , the included angle θ2 , the included angle θ3 and the included angle α and the effective imaging distance d12 combine with the focal length F of the curved mirror to calculate the included angle θ4 , satisfying θ4 + 2 * θ2 + 2 * θ3 - θ1 - α = 90° ; Step 4: According to the width l of the display source 1, the effective imaging distance d12 , the focal length F of the curved mirror 2, the incident angle β and the included angle α calculate the proportionality coefficient, and adjust the width η of the standing image 4 according to the proportionality coefficient H ; Step 5: According to the width H of the standing image 4, the width l, d2 Effective imaging distance d12 Angle θ2 Angle α Incident angle β Calculate the height from the center of the standing image 4 to the plane where the center of the beam splitting plate 3 is located d3 to ensure the projection effect of the standing image 4.

[0029] The imaging distance described in Step 1 d12 As shown in formula (1): d12 = (d1 + d2) / sin(θ1 + α) (1).

[0030] The incident angle described in Step 2 β As shown in formula (2): β = θ2 + 2 * θ3 - θ1 - α (2).

[0031] The angle described in Step 3 θ4 As shown in formula (3): θ4 = arctan[(d12 * cosβ - F) / (F * tanα)] (3).

[0032] The proportionality coefficient described in Step 4 η As shown in formula (4): η = 4F(d12 * cosβ - F)cosα / {[(2 * d12 - l * sinα)cosβ - 2 * F] * [(2 * d12 + l * sinα)cos β - 2 * F]sinθ4} (4); The width of the standing image 4 H As shown in formula (5): H = η * l (5).

[0033] The height from the center of the standing image 4 to the plane where the center of the beam splitting plate 3 is located described in Step 5 d3 As shown in formula (6): d3 = [d12 * F * cos(π / 2 - θ2 - β) / (d12 * cosβ - F)] - d2+{l * F * cosα / [(2 * d12 - l * sinα)cosβ - 2 * F ]} -（H / 2） (6).

[0034] Embodiment 2 To demonstrate the effect of the device of the present invention, the present invention is described in detail: Based on the design method of a desktop floating display system in Embodiment 1, a desktop floating display system is designed as shown in Figures 3 - 4. The floating display system includes three parts: a display source 1, a curved mirror 2, and a beam-splitting plate 3. The display source 1 is located 77 mm below the beam-splitting plate 3, with a length of 48 mm and a width of 32 mm, and is placed at an angle of 41° with respect to the vertical direction. The curved mirror 2 is located 47 mm below the beam-splitting plate 3, with a length of 220 mm and a width of 160 mm, and is placed at an angle of 19° with respect to the vertical direction. Its surface shape is a free-form surface, with a radius of curvature of 224 mm and a conic coefficient of -0.960. The beam-splitting ratio of the beam-splitting plate 3 is 1, with a length of 190 mm and a width of 244 mm, and is placed at an angle of 15° with respect to the horizontal direction. The display system can finally form a standing floating image with a width of 60 mm at 49 mm above the beam-splitting plate.

[0035] As Figures 5 - 6 shown, the floating display system includes three parts: a display source 1, a curved mirror 2, and a beam-splitting plate 3. The display source 1 is located 96 mm below the beam-splitting plate 3, with a length of 50 mm and a width of 52 mm, and is placed at an angle of 13° with respect to the vertical direction. The curved mirror 2 is located 136 mm below the beam-splitting plate 3, and is placed at an angle of 31° with respect to the vertical direction. Its surface shape is a free-form surface, with a radius of curvature of 404 mm and a conic coefficient of -0.882. The beam-splitting ratio of the beam-splitting plate 3 is 1, with a length of 491 mm and a width of 491 mm, and is placed at an angle of 0° with respect to the horizontal direction. The display system can finally form a standing floating image with a width of 150 mm at 135 mm above the beam-splitting plate.

[0036] As Figure 7 shown, the floating display system includes five parts: display sources 1a, 1b, curved mirrors 2a, 2b, and a beam-splitting plate 3. The display sources 1a and 1b are located 96 mm below the beam-splitting plate 3, with a length of 50 mm and a width of 52 mm, and are placed at an angle of 13° with respect to the vertical direction. Display source 1a is tilted 30° to the left in the horizontal direction, and display source 1a is tilted 30° to the right in the horizontal direction. The curved mirrors 2a and 2b are located 136 mm below the beam-splitting plate 3, and are placed at an angle of 31° with respect to the vertical direction. Its surface shape is a free-form surface, with a radius of curvature of 404 mm and a conic coefficient of -0.882. Curved mirror 2a is tilted 30° to the left in the horizontal direction, and curved mirror 2a is tilted 30° to the right in the horizontal direction. The beam-splitting ratio of the beam-splitting plate 3 is 1, with a length of 1000 mm and a width of 600 mm, and is placed at an angle of 0° with respect to the horizontal direction. The display system can finally form two standing floating images with a width of 150 mm at 135 mm above the beam-splitting plate ( Figure 7 a and b in

[0037] The above-described embodiments are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features, and principles described in the scope of the present invention patent should be included within the scope of the present invention's patent application.

Claims

1. A desktop suspended display system, comprising a display source (1), a curved reflector (2) and a beam splitter plate (3), characterized in that: The display source (1) and the curved reflector (2) are arranged below the light splitting plate (3), and the display source (1) and the curved reflector (2) are arranged opposite to each other, and an angle is set between the display source (1) and the vertical direction. θ1 , an angle is set between the curved reflector (2) and the vertical direction θ2 , an angle is set between the light splitting plate (3) and the horizontal direction θ3 ; The display source (1) is used to project an image, and an angle is set between the main light projected by the display source (1) and the plane normal of the display source (1) α , light emitted by the display source (1) first reaches the beam splitter plate (3), and then the beam splitter plate (3) reflects part of the light to the curved reflector (2), and is reflected at the curved reflector (2), reaches the beam splitter plate (3) again and passes through the beam splitter plate (3), thereby generating a suspended image in space; The incident angle of the principal ray on the curved reflector (2) is β , there is an angle between the suspended image and the main light θ4 ; The angle θ3 The range is 0°≤θ3≤30° ; when θ4+2*θ2+2*θ3-θ1-α=90° , the suspended image is perpendicular to the horizontal direction to form a standing image (4).

2. A method for designing a desktop floating display system, used to design a desktop floating display system, characterized in that: The method comprises: Step 1: obtaining the distance from the center of the display source (1) to the light splitting plate (3) d1 , obtain the distance from the curved reflector (2) to the beam splitter plate (3) d2 ,according to d1 and d2 and angle α Calculation shows the effective imaging distance from the source (1) to the curved reflector (2) d12 ; Step 2: Measure the angle θ1 , Angle θ2 , Angle θ3 and angle α Calculating the angle of incidence β ; Step 3: According to the angle θ1 , Angle θ2 , Angle θ3 and angle α and effective imaging distance d12 Combined with the focal length of the curved mirror F Calculate the angle θ4 ,satisfy θ4+2*θ2+2*θ3-θ1-α=90° ; Step 4: Based on the width of the display source (1) l , Effective imaging distance d12 , the focal length of the curved reflector (2) F , angle of incidence β and angle α Calculate the proportionality factor, based on the proportionality factor η Adjust the width of the standing image (4) H ; Step 5: Based on the width of the standing image (4) H , Display source (1) width l , d2 , Effective imaging distance d12 , Angle θ2 , Angle α , angle of incidence β Calculate the height from the center of the standing image (4) to the plane where the center of the beam splitter plate (3) is located d3 , ensuring the projection effect of the standing image (4).

3. The design method of a desktop floating display system according to claim 2, characterized in that: Imaging distance as described in step 1 d12 As shown in formula (1): d12=(d1 ＋ d2) / sin(θ1+α) （1）。 4. The design method of a desktop floating display system according to claim 3, characterized in that: The incident angle in step 2 β As shown in formula (2): β=θ2+2*θ3-θ1-α （2）。 5. The design method of a desktop floating display system according to claim 4, characterized in that: Angle described in step 3 θ4 As shown in formula (3): θ4=arctan[(d12*cosβ-F) / (F*tanα)] （3）。 6. The design method of a desktop floating display system according to claim 2, characterized in that: The proportionality factor described in step 4 η As shown in formula (4): η=4F(d12*cosβ-F)cosα / {[(2*d12-l*sinα)cosβ-2 *F] *[(2*d12+l*sinα)cosβ-2 * F]sinθ4} （4）; Width of the standing image (4) H As shown in formula (5): H=η*l （5）。 7. The design method of a desktop floating display system according to claim 6, characterized in that: The height from the center of the standing image (4) in step 5 to the plane where the center of the beam splitter plate (3) is located d3 As shown in formula (6): d3= [d12 * F*cos(π / 2-θ2-β) / (d12 *cosβ-F)]-d2+{ l*F*cosα / [(2*d12-l* sinα)cosβ-2*F]} - （H / 2） (6)。 8. The desktop floating display system according to claim 1, characterized in that: The device comprises a beam splitter plate (3), a plurality of display sources (1) and a curved reflector (2).

9. The desktop floating display system according to claim 1, characterized in that: The device comprises a beam splitting plate (3), a plurality of display sources (1) and a combination of a plurality of curved reflectors (2).

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