Medium-free air suspension display device with large visual angle

Abstract

The utility model relates to the field of optical display, in particular to a medium-free air suspension display device with a large visual angle. Comprising a display capable of emitting polarized light, a reflective polaroid, a 1 / 4 wave plate and a composite multi-plane large-angle light reflex reflector, the reflective polaroid is placed above or on one side of the display, a light-emitting surface of the display faces the reflective polaroid, the 1 / 4 wave plate is placed on the same side, where the display is placed, of the reflective polaroid, and the composite multi-plane large-angle light reflex reflector is placed on the reflective polaroid. The light retro-reflector is placed behind the 1 / 4 wave plate, and a polarized light imaging light beam emitted by the display is reflected by the reflective polaroid, penetrates through the 1 / 4 wave plate, is emitted to the light retro-reflector, passes through the 1 / 4 wave plate again, and is emitted to the reflective polaroid. According to the utility model, the polarized light emitted by the display is converted among the reflective polaroid, the 1 / 4 wave plate and the light reflex reflector, and finally a medium-free suspension image visible to naked eyes is formed in the air at the other side of the reflective polaroid.

Description

Technical Field

[0001] The utility model relates to the field of optical display, in particular to a medium-free air suspension display device with a large viewing angle. Background Art

[0002] With the development of optical display technology, more and more electronic products are using physical screens for display. The mobile phones, computers, car central control screens, etc. that we use daily need to be placed with one or more physical display screens to solve the problem of displaying information content.

[0003] Compared with physical display screens with media, the media-free floating display technology has a strong sense of technology due to its media-free floating display characteristics. At the same time, the media-free floating display avoids the contact between the user and the physical display device, reducing the possibility of cross-infection of germs. It has very broad application prospects in elevator buttons, hospital self-service registration and payment, ATM and other fields.

[0004] To solve the problem of medium-free floating display, it is necessary to collect and reconstruct the imaging light emitted by the physical display screen, so that the emitted light can be re-converged in the air to form an image.

[0005] like Figure 1 and Figure 2 As shown in the figure, the most relevant non-medium suspension display technology uses a DCRAdihedral corner reflector array lens to reflect the image of the physical display below or on either side to the other side of the DCRAdihedral corner reflector array lens, forming a non-medium suspension display effect in the air. This technology is made of two flat glass sheets formed by bonding several glass strips through optical glue, and optical reflective surfaces need to be plated on both sides of the glass strips.

[0006] However, the current DCRA dihedral corner reflector array (DCRA) lens technology generally has the following technical difficulties, which affect the practical application of this technology: small viewing angle. Since a single straight dihedral corner reflector is used to reflect light and converge into an image, the actual viewing angle is less than 90°, which limits the user experience. Utility Model Content

[0007] The utility model provides a medium-free air suspension display device with a large viewing angle, aiming to solve the technical problems existing in the existing medium-free suspension display technology.

[0008] The utility model provides a medium-free air suspension display device with a large viewing angle, comprising a display capable of emitting polarized light, a reflective polarizer, a quarter wave plate, and a composite multi-plane large-angle light return reflector, wherein the reflective polarizer is placed above or on one side of the display, the light emitting surface of the display faces the reflective polarizer, the quarter wave plate is placed on the same side of the reflective polarizer as the display, the light return reflector is placed behind the quarter wave plate, and the polarized light imaging light beam emitted by the display is reflected by the reflective polarizer, passes through the quarter wave plate, and is emitted to the light return reflector, and then passes through the quarter wave plate again and is emitted to the reflective polarizer.

[0009] As a further improvement of the utility model, the polarized imaging light beam emitted by the display is perpendicular to the polarization direction of the reflective polarizer.

[0010] As a further improvement of the present invention, the polarized light imaging light beam directed toward the light return reflector and after passing through the 1 / 4 wave plate again is consistent with the polarization direction of the reflective polarizer.

[0011] As a further improvement of the present invention, the display is a 2D flat TFT display or a light field 3D TFT display.

[0012] As a further improvement of the present invention, the reflective polarizer is a DBEF film.

[0013] As a further improvement of the utility model, the light return reflector is composed of two or more return reflective lenses in different planes, and the upper surface or the interior of the return reflective lenses in each plane is connected to a plurality of three-sided right-angle reflector micro-units, and any two reflective planes in each of the three-sided right-angle reflector micro-units are perpendicular to each other.

[0014] As a further improvement of the utility model, a plurality of the three-sided right-angle reflector micro-units are arranged in an array on the upper surface or inside of the retro-reflective lens, and the types of array arrangements include matrix arrangement, triangular staggered arrangement, petal-shaped arrangement, and concentric circle arrangement.

[0015] As a further improvement of the present invention, in each of the retro-reflective lenses, a plurality of the three-sided right-angle reflector micro-units together constitute a lens reflective surface, and an angle formed by the lens reflective surface of each retro-reflective lens and the lens reflective surface of another retro-reflective lens is greater than 90°.

[0016] As a further improvement of the present invention, a plurality of the retro-reflective lenses are connected to each other, or a plurality of the retro-reflective lenses are spaced apart from each other.

[0017] As a further improvement of the present invention, the imaging light beam incident into the three-sided right-angle reflector micro-unit is reflected by the reflection plane three times and then retro-reflected in a direction parallel to the original incident direction.

[0018] The beneficial effect of the utility model is: the polarized light emitted by the display is converted between the reflective polarizer, the quarter wave plate, and the light return reflector, and finally a medium-free suspended image visible to the naked eye is formed in the air on the other side of the reflective polarizer. It brings feasibility to the implementation of medium-free suspended display devices in the automotive industry, and the relatively low production cost enables the technology to be applied to the consumer field, with a strong suspended display effect, bringing significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the first structural schematic diagram of the existing medium-free suspension display technology;

[0020] Figure 2 It is a second structural schematic diagram of the existing medium-free suspension display technology;

[0021] Figure 3 This is the overall structural diagram of the medium-free air suspension display device with a large viewing angle of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the display device capable of emitting polarized light in the utility model;

[0023] Figure 5 This is a structural principle diagram of the reflective polarizer in the utility model;

[0024] Figure 6 This is a structural principle diagram of a quarter wave plate in the utility model;

[0025] Figure 7 This is a structural diagram of the composite multi-plane large-angle light retro-reflector in the utility model;

[0026] Figure 8 It is a structural diagram of a three-sided right-angle reflector micro-unit in the utility model;

[0027] Fig. 9 It is a diagram showing the light emission direction of the light emitting point A in the composite multi-plane large-angle light return reflector in the utility model. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] like Figure 3As shown, the utility model is a medium-free air suspension display device with a large viewing angle, comprising a display 1 capable of emitting polarized light, a reflective polarizer 2, a quarter wave plate 3, and a composite multi-plane large-angle light return reflector 4, wherein the reflective polarizer 2 is placed above or on one side of the display 1, the light-emitting surface of the display 1 faces the reflective polarizer 2, the quarter wave plate 3 is placed on the same side of the reflective polarizer 2 as the display 1, and the light return reflector 4 is placed behind the quarter wave plate 3, and the polarized light imaging light beam emitted by the display 1 is reflected by the reflective polarizer 2, passes through the quarter wave plate 3, and is emitted to the light return reflector 4, and then passes through the quarter wave plate 3 again and is emitted to the reflective polarizer 2.

[0030] like Figure 4 As shown, the display 1 capable of emitting polarized light is preferably a light field 3D TFT display 1. The light field 3D TFT display 1 itself has a polarizer, which can emit a linearly polarized light imaging beam, and the light field 3D TFT display 1 can realize 3D display, and can realize 3D stereoscopic suspension display with the device of the utility model, and can realize a viewing angle greater than 90 degrees.

[0031] like Figure 5 As shown, the reflective polarizer 2 is a DBEF film. The DBEF film has good reflectivity for linear polarized imaging light perpendicular to the BBEF angle direction, and has good transmittance for linear polarized imaging light consistent with the BBEF angle direction, and has low cost, and its imaging effect is significantly better than that of a semi-transparent and semi-reflective film.

[0032] like Figure 6 As shown, for the 1 / 4 wave plate 3, after the polarized light imaging beam passes through the reflective surface, the polarized light rotation direction is reversed, and after passing through the 1 / 4 wave plate 3 again, it becomes polarized light perpendicular to the polarization direction of the original incident light. The polarized light imaging beam emitted by the display 1 is perpendicular to the polarization direction of the reflective polarizer 2. At this time, the reflective polarizer 2 plays a reflective role, and the polarized light imaging beam directed toward the light returns to the reflector 4. After passing through the 1 / 4 wave plate 3 again, the polarization direction of the polarized light is consistent with that of the reflective polarizer 2. At this time, the reflective polarizer 2 plays a light transmitting role.

[0033] like Figure 7 and Figure 8 As shown, the light retro-reflector 4 is composed of two or more retro-reflective lenses 6 in different planes, and a plurality of three-sided right-angle reflector micro-units 7 are connected to the upper surface or the interior of the retro-reflective lens 6 in each plane, and any two reflection planes 8 in each three-sided right-angle reflector micro-unit 7 are perpendicular to each other. After the light incident into the three-sided right-angle reflector micro-unit 7 is reflected by the three reflection planes 8, it will be retro-reflected in a direction parallel to the original incident direction.

[0034] A plurality of three-sided right-angle reflector micro-units 7 are arranged in an array on the upper surface or inside of the retro-reflector lens 6. The types of array arrangement include determinant arrangement, triangular staggered arrangement, petal-shaped arrangement, and concentric circle arrangement. A plurality of three-sided right-angle reflector micro-units 7 are arranged on the upper surface of the three-sided right-angle reflector array plate. Any two plane reflectors of the three-sided right-angle reflector micro-units 7 are perpendicular to each other. The unit arrangement can be in the form of determinant, triangular staggered arrangement, petal-shaped arrangement, concentric circle arrangement, etc., and a reflective film is plated on the three-sided right-angle reflector micro-units 7. The flat-plate three-sided right-angle micro-reflector array can be realized by injection molding or embossing + coating process. The manufacturing process is convenient, the cost is greatly reduced, and the large-scale popularization of medium-free suspension display products with large viewing angles is strongly promoted.

[0035] In each retro-reflective lens 6, a plurality of three-sided right-angle reflector micro-units 7 together form a lens reflection surface, and the angle formed by the lens reflection surface of each retro-reflective lens 6 and the lens reflection surface of another retro-reflective lens 6 is greater than 90°. Multiple retro-reflective lenses 6 are connected to each other, or multiple retro-reflective lenses 6 are spaced apart from each other. Two or more retro-reflective lenses 6 are combined together, and the edges of the reflective lenses can be connected to each other or kept at a certain distance. The retro-reflective lenses 6 in the two reflective lenses that are on different planes, the reflection surface formed by the array of three-sided right-angle reflector micro-units 7 in each retro-reflective lens 6 and the reflection surface of another retro-reflective lens form an angle greater than 90°. In this way, the two reflector array plates are combined together to expand the retro-reflection angle to more than 90 degrees.

[0036] The composite multi-plane large-angle light retro-reflector 4 can retro-reflect the light in a large-angle divergent light beam (divergent light beam greater than 90 degrees) emitted from a certain light-emitting point in the object-side image source according to the respective incident angles of the light rays, so that the retro-reflected light rays converge again on the same mirror light point in the air, and the angle of divergence of the mirror light point after convergence is greater than 90°, thereby providing the observer with a mirror image with a viewing angle greater than 90°.

[0037] The working principle of the medium-free air suspension display device with a large viewing angle is:

[0038] The imaging light with linear polarization state emitted by the polarized light display 1 is incident on the reflective polarizer 2. The reflective polarizer 2 reflects the linear polarization light perpendicular to its own polarization direction and reflects the imaging light to the 1 / 4 wave plate 3. After the light passes through the 1 / 4 wave plate 3, the original incident linear polarization state light is converted into elliptically polarized state light and continues to propagate toward a three-sided right-angle reflector micro unit 7 in the composite multi-plane large-angle light return reflector 4.

[0039] Since any two plane reflectors in the three-sided right-angle reflector unit are perpendicular to each other, the light incident into the three-sided right-angle reflector micro unit 7 will be reflected by the three-time reflection plane 8 and then return in a direction parallel to the original incident direction.

[0040] Each time the elliptically polarized light is reflected by the reflection plane 8, the rotation direction of the elliptically polarized light is reversed. After being reflected by the reflection plane 8 three times, the rotation direction of the elliptically polarized light is opposite to the direction before it is incident on the three-sided right-angle reflector microunit 7, and continues to be elliptically polarized, and is incident on the 1 / 4 wave plate 3 again. The 1 / 4 wave plate 3 converts the elliptically polarized light rotating in the opposite direction into linear polarized light that is perpendicular to the polarization direction of the last incident 1 / 4 wave plate 3, and emits it to the reflective polarizer 2. The reflective polarizer 2 transmits the linear polarized light that is consistent with its own polarization direction. After the imaging light passes through the reflective polarizer 2, the imaging light initially emitted by the polarized light display 1 is located on the other side of the reflective polarizer 2 and in an approximately symmetrical direction, and continues to propagate in the air.

[0041] For light rays in other directions emitted from the light emitting point on the polarized light display 1, after undergoing the same steps as the above process, they converge in the air at the position of the mirror image of the light emitting point on the other side of the reflective polarizer 2 and the polarized light display 1, and form a real image light emitting point.

[0042] For the light emitted by other light-emitting points on the polarized light display 1, after undergoing the same steps as the above process, at the position of the mirror image of the light-emitting point on the other side of the reflective polarizer 2, the light emitted by the light-emitting point converges in the air to form real image light-emitting points corresponding to other light-emitting points.

[0043] Through the above device, a medium-free suspended image 5 visible to naked eyes is formed in the air on the other side of the reflective polarizer 2 .

[0044] like Fig. 9 As shown, the divergent light emitted by the light point A has a return reflection angle formed on the reflection surface formed by the single three-sided right-angle reflector micro-unit 7 array within 90 degrees. When two reflector array plates with an angle greater than 90 degrees between them are combined together, the two return reflection angles within 90 degrees are superimposed and combined together, so a return reflection light beam with a total divergence angle greater than 90 degrees can be formed, so that a real image point with a viewing angle greater than 90 degrees is obtained on the other side after the light spot is returned and converged, thereby increasing the viewing angle.

[0045] The utility model effectively solves the problem of insufficient viewing angle of the current floating display 1, and brings feasibility to the application of medium-free floating display devices in the automotive industry. The relatively low production cost enables the technology to be applied to the consumer field, and it has a strong floating display effect, bringing significant economic and social benefits.

[0046] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A medium-free air suspension display device with a large viewing angle, characterized in that: The invention comprises a display capable of emitting polarized light, a reflective polarizer, a quarter wave plate, and a composite multi-plane large-angle light return reflector, wherein the reflective polarizer is placed above or on one side of the display, the light emitting surface of the display faces the reflective polarizer, the quarter wave plate is placed on the same side of the reflective polarizer as the display, and the light return reflector is placed behind the quarter wave plate. The polarized light imaging beam emitted by the display is reflected by the reflective polarizer, passes through the quarter wave plate, and is emitted to the light return reflector, and then passes through the quarter wave plate again and is emitted to the reflective polarizer.

2. The medium-free air suspension display device with a large viewing angle according to claim 1, characterized in that: The polarized imaging light beam emitted by the display is perpendicular to the polarization direction of the reflective polarizer.

3. The medium-free air suspension display device with a large viewing angle according to claim 1, characterized in that: The polarized light imaging light beam directed toward the light return reflector and after passing through the 1 / 4 wave plate again is consistent with the polarization direction of the reflective polarizer.

4. The medium-free air suspension display device with a large viewing angle according to claim 1, characterized in that: The display is a 2D flat TFT display or a light field 3D TFT display.

5. The medium-free air suspension display device with a large viewing angle according to claim 1, characterized in that: The reflective polarizer is a DBEF film.

6. The medium-free air suspension display device with a large viewing angle according to claim 1, characterized in that: The light return reflector is composed of two or more return reflective lenses located in different planes, and a plurality of three-sided right-angle reflective mirror micro-units are connected to the upper surface or the interior of the return reflective lens located in each plane, and any two reflective planes in each of the three-sided right-angle reflective mirror micro-units are perpendicular to each other.

7. The medium-free air suspension display device with a large viewing angle according to claim 6, characterized in that: A plurality of the three-sided right-angle reflector micro-units are arranged in an array on the upper surface or inside of the retro-reflective lens. The types of array arrangements include row-and-column arrangement, triangular staggered arrangement, petal-shaped arrangement, and concentric circle arrangement.

8. The medium-free air suspension display device with a large viewing angle according to claim 6, characterized in that: In each of the retro-reflective lenses, a plurality of the three-sided right-angle reflector micro-units together form a lens reflective surface, and an angle formed by the lens reflective surface of each retro-reflective lens and the lens reflective surface of another retro-reflective lens is greater than 90°.

9. The medium-free air suspension display device with a large viewing angle according to claim 6, characterized in that: The multiple retro-reflective lenses are connected to each other, or the multiple retro-reflective lenses are spaced apart from each other.

10. The medium-free air suspension display device with a large viewing angle according to claim 6, characterized in that: After being reflected by three reflection planes, the imaging light beam incident into the three-sided right-angle reflector micro-unit is retro-reflected in a direction parallel to the original incident direction.

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