阅读说明：本技术 全息透镜、全息透镜组件以及显示系统 (Holographic lens, holographic lens assembly and display system ) 是由 张峰 石阳 于 2019-09-26 设计创作，主要内容包括：本发明提供一种全息透镜以及应用全息透镜的全息透镜组件以及显示系统。全息透镜包括层叠设置的第一透镜、透过层及第二透镜；第一透镜上形成第一锯齿阵列,第一锯齿阵列包括多个第一锯齿,每个第一锯齿的横截面均包括直角边以及斜边；第二透镜上形成第二锯齿阵列,第二锯齿阵列包括多个第二锯齿,每个第二锯齿的横截面均包括直角边以及斜边；第一透镜的折射率与第二透镜的折射率相等,第一锯齿线形延伸的方向垂直于第二锯齿线形延伸的方向。本发明提供的全息透镜,利用光线在直角边上的全反射,从而将图像源所发射的图像投影至空间上,进而实现真正意义上的裸眼3D成像。(The invention provides a holographic lens, a holographic lens component applying the holographic lens and a display system. The holographic lens comprises a first lens, a transmission layer and a second lens which are arranged in a laminated mode; a first sawtooth array is formed on the first lens and comprises a plurality of first sawteeth, and the cross section of each first sawtooth comprises a right-angled edge and a hypotenuse edge; a second sawtooth array is formed on the second lens and comprises a plurality of second sawteeth, and the cross section of each second sawtooth comprises a right-angled edge and a hypotenuse edge; the refractive index of the first lens is equal to that of the second lens, and the extending direction of the first sawtooth line shape is perpendicular to that of the second sawtooth line shape. The holographic lens provided by the invention utilizes the total reflection of light rays on the right-angle side, so that an image emitted by an image source is projected to a space, and further, the naked eye 3D imaging is realized in a real sense.)

1. A holographic lens includes a first lens, a transmission layer, and a second lens stacked in layers; the first lens is outwards convexly arranged on one side, facing the transmission layer, of the first lens to form a first sawtooth array, the first sawtooth array comprises a plurality of first sawteeth, each first sawtooth extends along a linear shape, the first sawteeth are parallel to each other and are arranged at equal intervals, and the cross section of each first sawtooth comprises a right-angle side perpendicular to the first lens and a bevel side inclined to the first lens at an angle of 45 degrees;

the second lens is outwards convexly arranged on one side, facing the transmission layer, of the second lens to form a second sawtooth array, the second sawtooth array comprises a plurality of second sawteeth, each second sawtooth extends along a linear shape, the second sawteeth are parallel to each other and are arranged at equal intervals, and the cross section of each second sawtooth comprises a right-angle side perpendicular to the second lens and a bevel side inclined to the second lens at an angle of 45 degrees; the transmission layer is embedded between the first sawtooth array and the second sawtooth array;

the refractive index of the first lens is equal to that of the second lens, and the extending direction of the first sawtooth line is perpendicular to that of the second sawtooth line.

2. The holographic lens of claim 1, wherein the length of the cathetus of the first saw tooth is not less than 0.4mm and not more than 1 mm; and/or the presence of a catalyst in the reaction mixture,

the length of the right-angle side of the second saw tooth is not less than 0.4mm and not more than 1 mm.

3. The hologram lens according to claim 1, wherein a length of a hypotenuse of the first saw tooth is not less than 0.4mm and not more than 1.4 mm; and/or the presence of a catalyst in the reaction mixture,

the length of the bevel edge of the second saw tooth is not less than 0.4mm and not more than 1.4 mm.

4. The holographic lens of claim 1, in which the refractive indices of the first lens and the second lens are not less than 1.4.

5. The holographic lens of claim 1, further comprising a first reflective layer disposed between the square edge of the first sawtooth and the transmissive layer and a second reflective layer disposed between the square edge of the second sawtooth and the transmissive layer.

6. The holographic lens of claim 5, in which the first reflective layer and the second reflective layer are metallic reflective layers or all dielectric reflective films.

7. The holographic lens of claim 6, wherein the first reflective layer is deposited on the right-angled edge of the first sawtooth and the second reflective layer is deposited on the right-angled edge of the second sawtooth; alternatively, the first and second electrodes may be,

the first lens and the second lens are at least one of plastic lenses or glass lenses.

8. A holographic lens component comprises at least two holographic lenses, wherein the two adjacent holographic lenses are mutually spliced along the side surface; characterized in that the holographic lens is the holographic lens of any of claims 1 to 7.

9. A display system comprising an image source and a holographic lens according to any of claims 1 to 7; alternatively, the first and second electrodes may be,

the display system comprising an image source and the holographic lens assembly of claim 8.

10. The display system of claim 9, wherein the image source is a two-dimensional image source or a three-dimensional image source.

Technical Field

The invention relates to the technical field of image display, in particular to a holographic lens, a holographic lens assembly and a display system.

Background

The rapid development of image display technology enables users to continuously improve the requirements for high-reality images, and people not only require better imaging quality, but also hope to realize naked eye 3D imaging effect. The existing three-dimensional imaging technology generally causes poor vision through a mode that left and right eyes receive polarized light in different directions, so that three-dimensional imaging is realized. However, the imaging mode based on visual difference is still three-dimensional imaging in sense, and is not three-dimensional holographic projection in a true sense.

Disclosure of Invention

In view of the above, there is a need for a holographic lens, a holographic lens assembly and a display system, which can spatially form a three-dimensional holographic image, thereby achieving a true naked-eye 3D effect.

The invention provides a holographic lens, which comprises a first lens, a transmission layer and a second lens which are arranged in a laminated manner; the first lens is outwards convexly arranged on one side, facing the transmission layer, of the first lens to form a first sawtooth array, the first sawtooth array comprises a plurality of first sawteeth, each first sawtooth extends along a linear shape, the first sawteeth are parallel to each other and are arranged at equal intervals, and the cross section of each first sawtooth comprises a right-angle side perpendicular to the first lens and a bevel side inclined to the first lens at an angle of 45 degrees;

the second lens is outwards convexly arranged on one side, facing the transmission layer, of the second lens to form a second sawtooth array, the second sawtooth array comprises a plurality of second sawteeth, each second sawtooth extends along a linear shape, the second sawteeth are parallel to each other and are arranged at equal intervals, and the cross section of each second sawtooth comprises a right-angle side perpendicular to the second lens and a bevel side inclined to the second lens at an angle of 45 degrees; the transmission layer is embedded between the first sawtooth array and the second sawtooth array;

the refractive index of the first lens is equal to that of the second lens, and the extending direction of the first sawtooth line is perpendicular to that of the second sawtooth line.

Further, the length of the right-angle side of the first sawtooth is not less than 0.4mm and not more than 1 mm; and/or the presence of a catalyst in the reaction mixture,

the length of the right-angle side of the second saw tooth is not less than 0.4mm and not more than 1 mm.

Further, the length of the bevel edge of the first sawtooth is not less than 0.4mm and not more than 1.4 mm; and/or the presence of a catalyst in the reaction mixture,

the length of the bevel edge of the second saw tooth is not less than 0.4mm and not more than 1.4 mm.

Further, the refractive index of the first lens and the refractive index of the second lens are not lower than 1.4.

Further, holographic lens still includes first reflection stratum and second reflection stratum, first reflection stratum set up in the right-angle side of first sawtooth with between the penetrating layer, the second reflection stratum set up in the right-angle side of second sawtooth with between the penetrating layer.

Further, the first reflective layer and the second reflective layer are both metal reflective layers or all dielectric reflective films.

Further, the first reflective layer is deposited on the right-angled side of the first sawtooth, and the second reflective layer is deposited on the right-angled side of the second sawtooth; alternatively, the first and second electrodes may be,

the first lens and the second lens are at least one of plastic lenses or glass lenses.

The invention also provides a holographic lens component which comprises at least two holographic lenses, wherein the two adjacent holographic lenses are mutually spliced along the side surface; the holographic lens is any one of the holographic lenses described above.

The invention also provides a display system comprising an image source and a holographic lens as described in any of the above; alternatively, the first and second electrodes may be,

the display system comprises an image source and a holographic lens assembly as described above.

Further, the image source is a two-dimensional image source or a three-dimensional image source.

According to the holographic lens provided by the invention, the reflection of light rays on the right-angle side is utilized through the first sawtooth array formed on the first lens and the second sawtooth array formed on the second lens, so that an image emitted by an image source is projected to a space, and further, the naked eye 3D imaging in the true sense is realized.

Drawings

FIG. 1 is a schematic diagram of a holographic lens according to an embodiment of the present invention;

FIG. 2 is a disassembled schematic view of the holographic lens shown in FIG. 1;

FIG. 3 is a schematic view of the holographic lens of FIG. 1 at another viewing angle;

FIG. 4 is a schematic diagram of optical path imaging of the holographic lens shown in FIG. 1;

FIG. 5 is an enlarged schematic view of the holographic lens of FIG. 3 at A;

FIG. 6 is a schematic structural diagram of a first lens of the holographic lens shown in FIG. 2 at a viewing angle α;

FIG. 7 is a schematic structural diagram of a first lens of the holographic lens shown in FIG. 2 at a viewing angle β;

FIG. 8 is an enlarged schematic view of the first lens shown in FIG. 7 at B;

FIG. 9 is a schematic structural diagram of a second lens of the holographic lens shown in FIG. 2 at a gamma viewing angle;

FIG. 10 is a schematic diagram of the second lens of the holographic lens of FIG. 2 at a viewing angle of δ;

fig. 11 is an enlarged schematic view of the second lens shown in fig. 10 at C.

Description of the main elements

Holographic lens	100
		First lens	10
First sawtooth array	11
		First saw tooth	12
Right-angle edge	13、33
		Bevel edge	14、34
Permeable layer	20
		Second lens	30
Second sawtooth array	31
		Second saw tooth	32
A first reflective layer	40
		Second reflecting layer	50
Image source	200

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 5 together, fig. 1 is a schematic structural diagram of a holographic lens 100 according to an embodiment of the present invention, fig. 2 is a disassembled schematic diagram of the holographic lens 100 shown in fig. 1, fig. 3 is a schematic structural diagram of the holographic lens 100 shown in fig. 1 at another viewing angle, fig. 4 is a schematic optical path imaging diagram of the holographic lens 100 shown in fig. 1, and fig. 5 is an enlarged schematic diagram of the holographic lens 100 shown in fig. 3 at a.

The holographic lens 100 is used to implement three-dimensional imaging, and can project an image emitted from an image source on one side of the holographic lens to the other side of the holographic lens, so as to spatially display the image, thereby implementing non-sensory and real three-dimensional (3D) imaging.

In this embodiment, the holographic lens 100 is applied to naked eye three-dimensional imaging of a home theater, the holographic lens 100 is disposed between a Liquid Crystal Display (LCD) of the home theater and a user, one of the panels is opposite to the LCD, and the other panel is opposite to the user, so that a picture displayed by the LCD is directly transmitted into a three-dimensional space to be viewed by the user with a naked eye 3D effect.

It is understood that the display screen provided when the holographic lens 100 is applied to a home theater is not limited to the liquid crystal display screen, and other types of display screens such as an Organic Light-Emitting Diode (OLED) may be used. The present invention also does not limit the application of the holographic lens 100 to home theaters, and in other embodiments, the holographic lens 100 may be applied to projectors, movie projectors, game interaction devices, or medical imaging devices as long as the display systems can apply the holographic lens 100 provided by the present invention.

Specifically, the hologram lens 100 includes a first lens 10, a transmissive layer 20, a second lens 30, a first reflective layer 40, and a second reflective layer 50, which are stacked. The first lens 10 protrudes outward toward the side of the transparent layer 20 and forms a first sawtooth array 11. The second lens 30 is protruded outward toward the side of the transparent layer 20 and forms a second saw tooth array 31. The transparent layer 20 is embedded in the first sawtooth array 11 and the second sawtooth array 31, and is sandwiched between the first lens 10 and the second lens 30 by the first sawtooth array 11 and the second sawtooth array 31. The first reflective layer 40 is disposed between the transmissive layer 20 and the first sawtooth array 11 of the first lens 10, and the second reflective layer 50 is disposed between the transmissive layer 20 and the second sawtooth array 31 of the second lens 30.

The first lens 10 and the second lens 30 are used for guiding light rays, and both can be used for allowing the light rays to enter and guiding the light rays into the transmitting layer 20; the first reflective layer 40 and the second reflective layer 50 are used for reflecting light incident through the first lens 10 or the second lens 30, and the first reflective layer 40 and the second reflective layer 50 converge light emitted from an image source through their own reflective characteristics, so as to converge an image on the other side of the holographic lens 100 relatively far from the image source.

It can be understood that the holographic lens 100 provided by the invention can be used for single image source imaging, that is, an image source is arranged on one side of the holographic lens 100, and naked eye imaging is performed on the other side of the holographic lens 100; double image source imaging can also be performed, that is, an image source is arranged on each of two sides of the holographic lens 100, and corresponding imaging of the screen image source is performed on each side of the holographic lens 100.

It can be understood that the present invention is the first emitting layer 40 and the second reflecting layer 50 disposed to improve the reflection capability of light at the interface between the first sawtooth array 11 and the transmissive layer 20 and the reflection capability at the interface between the second sawtooth array 31 and the transmissive layer 20; the image brightness and resolution of the holographically projected image are high.

It is understood that the first reflective layer 40 and the second reflective layer 50 may be omitted if the conditions allow; at this time, the light is directly reflected at the interface between the first sawtooth array 11 and the transmissive layer 20 and the interface between the second sawtooth array 31 and the transmissive layer 20, thereby completing the holographic projection process.

The first lens 10, the transmissive layer 20, and the second lens 30 may be rectangular plates, preferably square plates, and the plate sizes (length, width, and thickness) of the first lens 10, the transmissive layer 20, and the second lens 30 are all the same, and the first lens 10, the transmissive layer 20, and the second lens 30 are stacked and form the hologram lens 100 with a rectangular cross section, in which the hologram lens 100 is relatively good in convenience of application and packaging, appearance beauty during use, and image convergence performance.

It is understood that the sizes of the surfaces of the first lens element 10, the transmissive layer 20 and the second lens element 30 may be different, for example, the lengths and widths of the first lens element 10 and the second lens element 30 may be greater than the lengths and widths of the transmissive layer 20; the present invention is not limited to the fact that the sizes of the first lens element 10, the transmissive layer 20, and the second lens element 30 need to be the same, as long as the adjustment of the sizes of the three elements does not affect the imaging function of the holographic lens 100.

The first lens 10, the transmissive layer 20, and the second lens 30 may also be formed of a trapezoidal plate, a diamond plate, or other flat plate structure, without considering the interference of the side inclination to the light converging performance.

In the present embodiment, the first lens element 10 and the second lens element 30 are both plastic lens elements, and the first lens element 10 and the second lens element 30 have relatively good crack resistance, and have certain advantages in terms of cost.

It is understood that in other embodiments, one or both of the first lens 10 and the second lens 30 may also be glass lenses, which have relatively high light transmittance and high brightness of the focused image.

Referring to fig. 6 to 8 together, fig. 6 is a schematic structural diagram of the first lens 10 in the holographic lens 100 shown in fig. 2 at an α viewing angle, fig. 7 is a schematic structural diagram of the first lens 10 in the holographic lens 100 shown in fig. 2 at a β viewing angle, and fig. 8 is an enlarged schematic diagram of the first lens 10 shown in fig. 7 at B.

The first lens 10 is outwards protruded towards one side of the transmission layer 20 to form a first sawtooth array 11, a first groove (not numbered) corresponding to the first sawtooth array 11 is formed on the transmission layer 20, and the first sawtooth array 11 is embedded in the first groove, so that concave-convex matching and mutual fixing between the first lens 10 and the transmission layer 20 are realized.

The first saw tooth array 11 includes a plurality of first saw teeth 12, each first saw tooth 12 extends along a line (i.e. is arranged in a row), and the plurality of first saw teeth 12 are arranged in parallel and at equal intervals. Each first sawtooth 12 comprises a perpendicular edge 13 and a hypotenuse 14 in cross section, and the plane of the perpendicular edge 13 and the plane of the hypotenuse 14 enclose each other and form the first sawtooth 12.

The right-angle side 13 is perpendicular to the first lens 10, that is, the extending direction of the right-angle side 13 is perpendicular to the extending direction of the mirror surface of the first lens 10; the inclined edge 14 forms an angle of 45 ° with the first lens 10, that is, an angle of 45 ° is formed between the extending direction of the inclined edge 14 and the extending direction of the mirror surface of the first lens 10.

In the present embodiment, since the first lens 10 is a square flat plate, the first saw-tooth 12 located at the center of the first lens 10 is longer than the first saw-tooth 12 located at the edge. The plurality of first saw teeth 12 are arranged in a row in parallel in a direction perpendicular to the extending direction thereof, and the first saw teeth 12, which are centered and have a relatively long length, are located at diagonal positions of the square first lens 10.

In the present embodiment, the first lens 10 is provided integrally with the first sawtooth array 11 in order to reduce loss of light on the transmission interface while considering compactness of the structure.

It is understood that in other embodiments, the first lens 10 and the first sawtooth array 11 may be formed in a separate structure, regardless of the loss of light intensity between the multiple interfaces.

Referring to fig. 9 to 11 together, fig. 9 is a schematic structural diagram of the second lens 30 in the holographic lens 100 shown in fig. 2 at a gamma viewing angle, fig. 10 is a schematic structural diagram of the second lens 30 in the holographic lens 100 shown in fig. 2 at a delta viewing angle, and fig. 11 is an enlarged schematic diagram of the second lens 30 shown in fig. 10 at C.

The second lens 30 is protruded outwards and forms a second sawtooth array 31 towards one side of the transparent layer 20, a second groove (not numbered) corresponding to the second sawtooth array 31 is formed on the transparent layer 20, and the second sawtooth array 31 is embedded in the second groove, so that concave-convex matching and mutual fixing between the second lens 30 and the transparent layer 20 are realized.

The second saw tooth array 31 includes a plurality of second saw teeth 32, each second saw tooth 32 extends along a line (i.e. is arranged in a row), and the plurality of second saw teeth 32 are arranged in parallel and at equal intervals. Each second saw tooth 32 comprises a perpendicular edge 33 and a hypotenuse 34 in cross section, and the plane of the perpendicular edge 33 and the plane of the hypotenuse 34 enclose each other and form the second saw tooth 32.

The right-angle side 33 is perpendicular to the second lens 30, that is, the extending direction of the right-angle side 33 is perpendicular to the extending direction of the mirror surface of the second lens 30; the inclined edge 34 forms an angle of 45 ° with the second lens 30, that is, the extending direction of the inclined edge 34 forms an angle of 45 ° with the extending direction of the mirror surface of the second lens 30.

In the present embodiment, since the second lens 30 is a square flat plate, the second saw-tooth 32 located at the center of the second lens 30 is longer than the second saw-tooth 32 located at the edge. The plurality of second saw teeth 32 are arranged in a row in a direction perpendicular to the extending direction of the plurality of second saw teeth 32, and the second saw teeth 32, which are centered and have a relatively long length, are located at diagonal positions of the square second lens 30.

In the present embodiment, the second lens 30 is integrally provided with the second sawtooth array 31 in order to reduce loss of light at the transmission interface while considering compactness of the structure.

It is understood that in other embodiments, the second lens 30 and the second sawtooth array 31 may be formed in a separate structure, regardless of the loss of light intensity between the multiple interfaces.

The transparent layer 20 is embedded between the first sawtooth array 11 and the second sawtooth array 31, one side of the transparent layer 20 is in concave-convex fit with the first sawtooth array 11 and is embedded with the first sawtooth array 11, and the other side of the transparent layer is in concave-convex fit with the second sawtooth array 31 and is embedded with the second sawtooth array 31.

It is understood that in other embodiments, in order to increase the connection reliability between the transmissive layer 20 and the first and second lenses 10 and 30, photosensitive adhesives may be disposed between the transmissive layer 20 and the first lens 10 and between the transmissive layer 20 and the second lens 30 to bond the transmissive layer 20 and the first and second lenses 10 and 30.

Further, the thickness of the photosensitive adhesive layer is preferably 0.01mm, and the thickness is uniformly set at the time of coating. The light and thin thickness of the photosensitive adhesive layer under the thickness can be considered on the basis of ensuring the adhesive force, and the uniformity of the photosensitive adhesive layer can be utilized to avoid interference on light transmission, so that the imaging effect is improved, and the over-thick thickness of the photosensitive adhesive layer is avoided, and the imaging definition is reduced.

Of course, the thickness of the photosensitive adhesive layer may be selected to be other numbers than 0.01mm regardless of the influence on the clarity and the adhesive force, as long as the photosensitive adhesive layer can smoothly adhere the transparent layer 20 and the first and second lenses 10 and 30.

The transparent layer 20, the first lens 10 and the second lens 30 may be surrounded by a transparent mechanical frame, and the three may be integrally assembled by surrounding and fixing. This approach is relatively advantageous for the assembly of multiple holographic lenses 100.

Of course, if the connection reliability of the concave-convex fit between the transmission layer 20 and the first and second lenses 10 and 30 meets the requirement of the working condition, the transmission layer 20 and the first and second lenses 10 and 30 are preferably fixed to each other by the concave-convex fit, so as to reduce the loss of the photosensitive adhesive and the mechanical frame to the light intensity.

The refractive index of the first lens 10 is equal to that of the second lens 30, the first reflective layer 40 is disposed between the perpendicular side 13 of the first saw tooth 12 and the transmissive layer 20, and the second reflective layer 50 is disposed between the perpendicular side 33 of the second saw tooth 32 and the transmissive layer 20. The direction in which the first saw teeth 12 linearly extend (i.e., the direction in which the first saw tooth array 11 linearly extends) is perpendicular to the direction in which the second saw teeth 32 linearly extend (i.e., the direction in which the second saw tooth array 31 linearly extends).

A first sawtooth array 11 formed by a plurality of first sawtooth arrays 12, so that each light ray (or a plurality of light rays with adjacent angles) emitted by an image source is reflected on the right-angled edge 13 of one first sawtooth 12; the second array of teeth 31 is formed by a plurality of second arrays of teeth 32 such that each light ray (or several light rays at adjacent angles) from the image source is reflected at the right-angled edge 33 of only one second tooth 32. The structure design can ensure that the light emitted by the image source can still be converged after the light is totally reflected through the light path, thereby reducing the interference of the complexity of the light path on the imaging of the image source.

Meanwhile, the first sawtooth array 11 and the second sawtooth array 31 are not arranged in the same direction, and the extending direction of the first sawtooth array 11 and the extending direction of the second sawtooth array 31 are arranged perpendicularly. At this time, the light emitted from the image source can be totally reflected to the other side in the two optical waveguide array layers.

It is understood that the first sawtooth array 11 and the edge of the first lens 10 may form other angles than 45 °, and the second sawtooth array 31 and the edge of the second lens 30 may form other angles than 45 °, as long as the extending direction of the first sawtooth array 11 and the extending direction of the second sawtooth array 31 are perpendicularly arranged.

In one embodiment of the invention, the length of the right-angled side 13 of the first sawtooth 12 is not less than 0.4mm and not more than 1 mm; and/or the presence of a catalyst in the reaction mixture,

the length of the right-angled edge 33 of the second sawtooth 32 is not less than 0.4mm and not more than 1 mm.

In one embodiment of the present invention, the length of the hypotenuse 14 of the first serration 12 is not less than 0.4mm and not more than 1.4 mm; and/or the presence of a catalyst in the reaction mixture,

the length of the hypotenuse 34 of the second serration 32 is not less than 0.4mm and not more than 1.4 mm.

At this time, the length maximum value and the length minimum value of the square edge 13 and the inclined edge 14 of the first sawtooth 12 and the length maximum value and the length minimum value of the square edge 33 and the inclined edge 34 of the second sawtooth 32 are both limited, so that the first sawtooth 12 and the second sawtooth 32 can be prevented from causing low image definition due to too sparse array density and too large volume, and the normal display of an image is interfered; meanwhile, the first sawteeth 12 and the second sawteeth 32 can be prevented from being too dense, and the situations that the production yield of the first lens 10 and the second lens 30 is too low and the manufacturing cost is too high can be avoided.

In one embodiment of the present invention, the refractive indexes of the first lens 10 and the second lens 30 are equal to each other and are not lower than 1.4.

At the moment, light rays can be perfectly reflected totally, certain design allowance is reserved between the reflection angle and the limit angle, the field angle of imaging can be improved, and an image source can be prevented from projecting and imaging only in a narrow angle. Of course, if the restriction of the angle of view on the image formation is not considered, the refractive indexes of the first lens 10 and the second lens 30 may be lower than 1.4 as long as the hologram lens 100 can smoothly form an image.

In one embodiment of the present invention, the first reflective layer 40 and the second reflective layer 50 are both metal reflective layers. Since the reflectivity of the metal reflective layer is relatively good, the brightness of the image after projection is also relatively good.

Preferably, aluminum foil is used for the first and second reflective layers 40 and 50. Since the reflectivity of aluminum can be as high as 90%, the cost is very advantageous, so that the holographic lens 100 has better cost performance, and the competitiveness is further improved.

Of course, the first reflective layer 40 and the second reflective layer 50 may also be made of other high reflective material layers such as silver, chromium, stainless steel, etc. besides aluminum, and the first reflective layer 40 and the second reflective layer 50 may also be made of all-dielectric reflective films.

In one embodiment of the present invention, the first reflective layer 40 is deposited on the square edges 13 of the first serrations 12; and/or the presence of a catalyst in the reaction mixture,

the second reflective layer 50 is deposited on the square edges 33 of the second serrations 32. In this case, the first reflective layer 40 is deposited on the first lens 10 by plating, and the second reflective layer 50 is deposited on the second lens 30 by plating, so that double-sided plating of the transmissive layer 20 can be avoided. Since both sides of the transparent layer 20 are relatively uneven, it is relatively difficult to achieve precise positioning of both sides during deposition processes such as electroplating. The first reflective layer 40 and the second reflective layer 50 are respectively disposed on the first lens 10 and the second lens 30, and the mirror surfaces of the first lens 10 and the second lens 30 can be used for positioning, so that the mirror surface effect obtained during deposition is better.

According to the holographic lens 100 provided by the invention, the first sawtooth array 11 formed on the first lens 10 and the second sawtooth array 31 formed on the second lens 30 are used for projecting the image emitted by the image source to the space by utilizing the reflection of light rays on the right-angle side 13 and the right-angle side 33, so that the true naked eye 3D imaging is realized.

The present invention also provides a holographic lens assembly (not shown) comprising at least two holographic lenses 100 as described above, wherein the two holographic lenses 100 are integrally joined to each other at their side surfaces. The holographic lens component can improve the receiving area of the holographic lens component through a plurality of splicing modes, has the flexibility advantage that the holographic lens component is miniaturized and spliced into large-scale when facing an image source with larger projection area, avoids the disadvantage that the receiving area can be improved only by enlarging the plate surface of one holographic lens 100, and has convenience in transportation, production and manufacturing.

The present invention also provides a display system (not shown) comprising an image source 200 and the holographic lens 100 described above; alternatively, the display system comprises an image source and the holographic lens assembly described above. That is, the display system may include at least one hologram lens 100, or may include a single hologram lens assembly having a plurality of hologram lenses 100 which are combined with each other.

Further, the image source 200 may be a two-dimensional image source or a three-dimensional image source. Two-dimensional image sources include, but are not limited to, LED display screens, OLED display screens, etc. image sources, and three-dimensional image sources include, but are not limited to, neon, etc. image sources.

The display system provided by the invention can directly form a three-dimensional image on the space by utilizing the holographic lens 100 or the holographic lens component, improves the ornamental value and the reality degree of the display, has great application value and wide application prospect in home theater playing, movie playing, game interaction and even medical imaging, and can make corresponding contribution to the improvement of the living standard of residents and the construction of the material civilization of the whole society.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.