CN105549207B - Multi-view angle stereo display device and angle amplifying screen thereof - Google Patents

Abstract

The present disclosure provides a multi-viewing angle stereoscopic display device and an angle magnifying screen thereof. The multi-viewing angle stereoscopic display device uses an angle magnifying screen to increase the viewing angle of an image beam from a projection lens. The angle magnifying screen includes a first lens unit, a central lens unit, and a second lens unit arranged in sequence. The first lens unit is configured to receive the image beam. The central lens unit is configured to receive the image beam from the first lens unit and change its transmission direction to project it to the second lens unit. The second lens unit is configured to magnify the viewing angle of the image beam.

Description

Multi-view stereoscopic display device and angle magnification screen thereof

technical field

The present disclosure relates to a display device and its optical elements, in particular to a multi-view stereo display device and its angle magnification screen.

Background technique

In recent years, in order to pursue more realistic and realistic images, display technologies have been continuously introduced to meet the needs of observers. From the pursuit of resolution and color in the early stage of flat display, to the recent three-dimensional display devices can further provide the observer with a three-dimensional experience other than images.

The main working principle of stereoscopic display is to send images of viewing objects from different angles to the left and right eyes respectively. According to the visual characteristics of human eyes, when two eyes watch two images with the same image content but with different parallax (Parallax), the observer You will feel that the objects you see have a sense of layering and depth, so that you can feel a three-dimensional stereoscopic image. In terms of application, it can be roughly divided into two ways of viewing with additional glasses or direct naked viewing. In recent years, the more important technological development has been dominated by the latter.

According to the visual characteristics of human eyes, when both eyes watch the same image at the same time, the images seen by the two eyes will be slightly different because the distance between the two eyes is about 65mm, forming a stereoscopic image. Stereoscopic display technology can be divided into stereoscopic and auto-stereoscopic. The auto-stereoscopic display technology can be further subdivided into spatial multiplex and time domain multiplex according to the imaging method. (time-multiplex).

However, no matter adopting the spatial multiplexing mode or the time domain multiplexing mode to achieve the stereoscopic display effect, there are disadvantages and problems to be overcome. Therefore, a new multi-view stereoscopic display is an urgent goal for the industry.

Contents of the invention

The main purpose of the present disclosure is to provide a multi-view stereoscopic display, which uses a light source device to send out image information, and an angle magnifying screen is arranged on the optical transmission path to enlarge the viewing angle of the image to meet the requirements of terminal applications.

According to an embodiment of the present disclosure, the multi-view stereoscopic display includes a projection lens configured to emit an image beam and an angle magnifying screen for receiving the image beam from the projection lens. In some embodiments, the angle magnifying screen includes a first lens unit, a second lens unit, and a central lens unit. The first lens unit includes a plurality of first lenticular lenses with a first focal length, arranged along a predetermined direction with a first interval between each other. The second lens unit includes a plurality of second lenticular lenses with a second focal length, arranged along the predetermined direction with a second interval between each other. The central lens unit is located between the first lens unit and the second lens unit, and is separated from the first lens unit by the first focal length. The central lens unit includes a plurality of central lenticular lenses with a third focal length arranged along the predetermined direction with a third distance between each other. The third distance satisfies the following formula:

Wherein, P _M is the third pitch, PA is the first pitch, TD is the projection distance of the image beam from the projection lens to the angle magnification screen, _{f a is} the first focal length, f _m is the third focal length.

In some embodiments, the second distance satisfies the following formula:

Wherein, P _B is the second distance, and N is a natural number greater than or equal to 1.

In some embodiments, the first lenticular lens includes a first axial lenticular lens, and the second lenticular lens includes a second axial lenticular lens, the first axial lenticular lens The optical axis of the lenticular lens and the optical axis of the second axial lenticular lens are co-located on a main axis.

In the above embodiment, along the predetermined direction, counting from another first lenticular lens adjacent to the first axial lenticular lens, the first lens unit includes X first lenticular lenses , and counting from another second lenticular lens adjacent to the second axial lenticular lens, the second lens unit includes X second lenticular lenses, wherein the Yth second lenticular lens The optical axis of the mirror lens is an offset from the optical axis of the first convex mirror lens Y, and the offset satisfies the following formula:

O _Y ＝Y*[P _B *NP _A ]

Wherein, P _B is the second distance, O _Y is the offset, Y is less than or equal to X, and N is a natural number greater than or equal to 1.

In some embodiments, the projection distance of the image beam from the projection lens to the angle magnification screen satisfies the following formula:

TD≥f _a /O _Y *W/2

Wherein W is the width of the first lens unit in the predetermined direction.

In some embodiments, the first focal length is equal to the third focal length.

In some embodiments, the first focal length is greater than the second focal length.

In some embodiments, the central lens unit and the second lens unit are spaced apart by the second focal length.

In some embodiments, the angle magnifying screen further includes a plurality of shading elements arranged between two adjacent second lenticular lenses.

In some embodiments, the angle magnifying screen further includes a plurality of shading elements disposed between two adjacent second lenticular lenses.

In some embodiments, the first lens unit and the central lens unit are integrally formed, the first lenticular lens faces a light-incident side (the side close to the projection lens) of the angle magnification screen, and the The central lenticular lens and the second lenticular lens face a light-emitting side (a side away from the projection lens) of the angle magnifying screen.

In some embodiments, the angle magnifying screen includes a plurality of second lens units, and the second lens units are sequentially arranged along the predetermined direction.

After referring to the accompanying drawings and the implementation methods described later, those skilled in the art can understand the purpose of the disclosure, the technical means and implementation aspects of the disclosure.

Description of drawings

FIG. 1 shows a schematic diagram of a multi-view stereoscopic display device according to some embodiments of the present disclosure.

FIG. 2 shows a partial structural diagram of a multi-view stereoscopic display device according to some embodiments of the present disclosure.

FIG. 3 shows a partial structural schematic diagram of a multi-view stereoscopic display device according to some embodiments of the present disclosure.

FIG. 4 shows a partial structural schematic diagram of a multi-view stereoscopic display device according to some embodiments of the present disclosure.

Fig. 5 shows a partial structural schematic diagram of an angle magnification screen in some embodiments of the present disclosure.

FIG. 6 shows a partial structural schematic diagram of an angle magnification screen in some embodiments of the present disclosure.

Explanation of reference signs:

1. 1a～multi-view stereoscopic display device

11～Light source module

112～projection lens

12, 13～Optical path conversion device

14, 14a, 14b ~ Angle to enlarge the screen

20～the first lens unit

21, 22, 23 ~ the first convex mirror lens

30, 30a, 30b ~ central lens unit

31a, 32a, 33a ~ central convex mirror lens

31b, 32b, 33b ~ central convex mirror lens

40, 40a, 40b, 40c ~ the second lens unit

41, 42, 43 ~ the second convex mirror lens

41a, 42a, 43a～the second lenticular lens

41b, 42b, 43b～the second convex mirror lens

41c, 42c, 43c, 44c, 45c~Second lenticular lens

60～Fresnel lens

80～vertical diffuser

90～Viewing area

C～Spindle

D～established direction

f _a ～first focal length

f _b ～second focal length

f _m ~ the third focal length

O ₁ , O ₂ ～offset

P _A ~ the first distance

P _B ～Second distance

P _M ~ the third distance

R0, R1, R2, R3, R4, R5, R6～coordinates

W～width

TD～projection distance

detailed description

A multi-view stereoscopic display device of the present disclosure will be explained below through an embodiment. It should be noted that the embodiments of the present disclosure are not intended to limit the present disclosure to be implemented in any specific environment, application or special method as described in the embodiments. Therefore, descriptions about the embodiments are only for the purpose of explaining the present disclosure, not limiting the present disclosure. In addition, the drawings may be drawn in a slightly simplified or slightly exaggerated manner, which is to facilitate understanding of the present disclosure, and the displayed elements are not the number, shape and size ratio of the implementation, and are not intended to limit the present disclosure. Let me describe it first.

Referring to FIG. 1 , it shows a schematic diagram of a multi-view stereoscopic display device 1 according to some embodiments of the present disclosure. In some embodiments, the multi-view stereoscopic display device 1 includes a light source module 11 , multiple optical path conversion devices, such as optical path conversion devices 12 , 13 , and an angle magnifying screen 14 . It should be understood that the number of elements of the multi-view stereoscopic display device 1 can be increased or decreased according to requirements, and is not limited by this embodiment.

In some embodiments, please refer to FIG. 2 at the same time. The light source module 11 generates a plurality of image light beams according to an image signal, and projects them substantially along a main axis C through the projection lens 112, the optical path conversion devices 12, 13, and the angle magnification screen 14. to the viewing area 90 to display video frames for viewers to watch. In some embodiments, in the image displayed by the multi-view stereoscopic display device 1, each pixel is composed of a plurality of image pixels with different directions (for example: 15 directions), so as to establish a three-dimensional light field, and To achieve the purpose of multi-angle viewing. Since the way the light source module 11 of the present invention generates the image light beam is an existing component in the field and is not the content emphasized in the present invention, it will not be repeated here.

Referring to FIG. 2 , it shows a schematic diagram of a partial structure of the multi-view stereoscopic display device 1 according to some embodiments of the present disclosure, wherein the partial structure of the angle magnifying screen 14 is not shown in FIG. 2 . In some embodiments, the angular magnification screen 14 includes a Fresnel lens (Fresnel Lens) 60, a first lens unit 20, a second lens unit 40, and a vertical diffuser (vertical diffuser) 80 in sequence along the axis C arrangement. The Fresnel lens 60 is configured to change the transmission direction of the image beam so that it transmits along a direction parallel to the main axis C. FIG. The first lens unit 20 and the second lens unit 40 are configured to enlarge the viewing angle of the incident light. The vertical diffuser 80 is configured to homogenize the light to improve image quality.

In some embodiments, the first lens unit 20 includes a plurality of first lenticular lenses protruding toward the light incident side, such as first lenticular lenses 21 , 22 , and 23 . The first lenticular lenses 21 , 22 , and 23 respectively have a first focal length f _a and are arranged along a predetermined direction D. The second lens unit 40 includes a plurality of second lenticular lenses, such as second lenticular lenses 41 , 42 , and 43 , protruding toward the light output side. The second lenticular lenses 41 , 42 , and 43 respectively have a second focal length f _b , and are arranged along the predetermined direction D. In some embodiments, the numbers of the first lenticular lens and the second lenticular lens are respectively equal to the number of image pixels of the multi-view stereoscopic display device 1 (for example: 1920*1080), so as to adjust the multi-view stereoscopic display accordingly. The optical characteristics of each image pixel of the device 1 .

In some embodiments, the distance between two adjacent first lenticular lenses 21 , 22 , and 23 is the same as the distance between two adjacent second lenticular lenses 41 , 42 , and 43 . Therefore, the optical axes of the second lenticular lenses 41 , 42 , and 43 are aligned with the optical axes of the first lenticular lenses 21 , 22 , and 23 , respectively. In some embodiments, the first lenticular lens and the second lenticular lens on the common optical axis are configured to change the viewing angle of the image beam, so that the viewing angle of the image beam is changed from a smaller angle Θ (for example: ±1 degree) to a larger angle Φ (eg: ±30 degrees). The ratio of the angle Φ to the angle Θ is the same as the ratio of the first focal length f _a to the second focal length f _b .

As shown in FIG. 2 , through the configuration of the angle magnifying screen 14 , multiple positions in the viewing area 90 can receive stereoscopic images from the multi-view stereoscopic display device 1 . However, when the image beam passes through the Fresnel lens 60 at an excessive incident angle, the image beam of the Fresnel lens 60 will generate chromatic aberration. The chromatic aberration will be further magnified by the first lens unit 20 and the second lens unit 40 , resulting in a decrease in image quality. In addition, since a plurality of grooves are formed on the surface of the Fresnel lens 60 , the image is likely to have a wave pattern or a groove pattern.

The following further provides various implementation manners of an angle magnified screen, so as to improve the disadvantages of the above-mentioned embodiments.

Referring to FIG. 3 , it shows a schematic diagram of some embodiments of another multi-view stereoscopic display device 1 a of the present disclosure, wherein a part of the structure of the angle magnifying screen 14 a is not shown in FIG. 3 . In this embodiment, elements identical or similar to those in FIG. 2 will be given the same reference numerals, and their features will not be described again to simplify the description. The difference between the multi-view stereoscopic display device 1a and the multi-view stereoscopic display device 1 of FIG. 2 includes that the angle magnification screen 14 is replaced by the angle magnification screen 14a.

In some embodiments, the angle magnifying screen 14a includes a first lens unit 20 , a central lens unit 30a , and one or more second lens units 40a arranged along a main axis C in sequence. The first lens unit 20 includes a plurality of first lenticular lenses, such as first lenticular lenses 21 , 22 , and 23 , protruding toward the light incident side and having a first focal length f _a . The optical axes of the first lenticular lenses 21 , 22 , and 23 are separated by a first pitch PA and arranged along a predetermined direction _D , wherein the optical axes of the first lenticular lenses 21 are aligned on the main axis C.

The central lens unit 30a includes a plurality of central lenticular lenses protruding toward the light emitting side and having a third focal length f _m , such as central lenticular lenses 31a, 32a, and 33a. The optical axes of the central lenticular lenses 31 a , 32 a , and 33 a are separated from each other by a third pitch _PM and arranged along a predetermined direction D, wherein the optical axis of the central lenticular lens 31 a is aligned on the main axis C. In some embodiments, the central lens unit 30 a is separated from the first lens unit 20 by a first focal distance f _a and separated from the second lens unit 40 a by a second focal distance f _b . In addition, the image beams passing through the first lenticular lenses 21 , 22 , and 23 respectively pass through the focal points of the corresponding central lenticular lenses 31 a , 32 a , and 33 a. Therefore, the transmission direction of the image beam passing through the first lenticular lenses 21 , 22 , and 23 is guided along the direction parallel to the main axis C by the corresponding central lenticular lenses 31 a , 32 a , and 33 a.

In some embodiments, as shown in FIG. 3 , the projection lens 112 is set at the position of coordinate R ₀ , the centers of the first lenticular lenses 21 and 22 are located at the positions of coordinates R ₁ and R ₂ respectively, and the central lenticular lenses The focal points of the lenses 31a and 32a are located at coordinates R ₃ and R ₄ , respectively. Since the triangle R ₁ R ₂ R ₀ and the triangle R ₃ R ₄ R ₀ are similar triangles, the third distance P _M satisfies the following formula (1):

Wherein, TD is the projection distance of the image beam from the projection lens 112 to the first lens unit 20 , hereinafter referred to as the projection distance.

The second lens unit 40a includes a plurality of second lenticular lenses protruding toward the light emitting side and having a second focal length _fb , such as second lenticular lenses 41a, 42a, and 43a. The optical axes of the second lenticular lenses 41 a , 42 a , and 43 a are spaced apart from each other by a second distance P _B and arranged along a predetermined direction D, wherein the optical axes of the second lenticular lenses 41 a are aligned on the main axis C. In some embodiments, the optical axes of the second lenticular lenses 41a, 42a, and 43a respectively pass through the position where the image beam exits the corresponding central lenticular lenses 31a, 32a, and 33a, so as to magnify the image from the central lenticular lens. The viewing angles of the image beams of the lenses 31a, 32a, and 33a.

For example, as shown in FIG. 3 , the position where the image beam exits from the central lenticular lens 31a is located at the coordinate R ₅ , and the optical axis of the second lenticular lens 41a passes through the coordinate R ₅ . In addition, the position where the image beam exits from the central lenticular lens 32a is located at the coordinate R ₆ , and the optical axis of the second lenticular lens 42a passes through the coordinate R ₆ . Since the triangle R ₁ R ₂ R ₀ and the triangle R ₅ R ₆ R ₀ are similar triangles, the second distance P _B satisfies the following formula (2):

Through the configuration of the second lenticular lenses 41a, 42a, and 43a, the viewing angles of the image light beams from the central lenticular lenses 31a, 32a, and 33a are enlarged from a relatively small angle Θ (for example: ±1 degree) to a Larger angle Φ (eg: ±30 degrees). The ratio of the angle Φ to the angle Θ is the same as the ratio of the first focal length f _a to the second focal length f _b .

It should be noted that, from formula (2), since the second pitch P _B is greater than the first pitch PA, so in the direction away from the main axis _C , the optical axis of the second convex mirror lens and the first convex mirror The offset of the optical axis of the shape lens will increase gradually. In some embodiments, along the predetermined direction D, counting from the next first lenticular lens (first axial lenticular lens) on the main axis C, the first lens unit 20 includes X first lenticular lenses in total. And, along the predetermined direction D, counting from the second lenticular lens (second axial lenticular lens) on the main axis to the next second lenticular lens, the second lens unit 40a includes a total of X Second convex mirror-like lens. The offset of the optical axis of the Y second convex mirror-shaped lens and the optical axis of the Y first convex mirror-shaped lens is to satisfy the following formula (3):

O _Y ＝Y*[P _B -P _A ](3)

where Y≦X.

For example, as shown in FIG. 3 , from the predetermined direction D, from the next first lenticular lens 22 of the first lenticular lens 21 (the first axial lenticular lens), the first The lens unit 20 includes two first lenticular lenses in total. And, along the predetermined direction D, counting from the next second lenticular lens 42a of the second lenticular lens 41a (second axial lenticular lens), the second lens unit 40a includes 2 second lenticular lenses in total. Convex mirror-like lens. The amount of deviation between the optical axis of the first second lenticular lens 42 a and the optical axis of the first first lenticular lens 22 is O ₁ =P _{B -PA} . The offset between the optical axis of the second second lenticular lens 43 a and the optical axis of the second first lenticular lens 23 is O ₂ =2*(P _{B −PA} ), and so on.

Referring to Fig. 4, in some embodiments, the first lens unit 20 and the central lens unit 30a are two optical films respectively, wherein the first lens unit 20 forms the opposite face of the first lenticular lens, and is the same as the central lens unit. The opposite surfaces of the central lenticular lens 30a are bonded (for example, glued) in a suitable way to form a composite optical film. However, the first lens unit 20 and the central lens unit 30a can also be integrally formed.

In some embodiments, the angle magnifying screen 14a includes a plurality of second lens units, such as second lens units 40a1, 40a2, and 40a3. The center of the second lens unit 40a1 is aligned with the main axis C, and the second lens unit 40a2 and the second lens unit 40a3 are respectively arranged on two sides of the second lens unit 40a1. Since the second lens units 40a1, 40a2, and 40a3 can be positioned relative to the central lens unit 30a, the image pixels of the angular magnification screen 14a can be increased. In addition, without sacrificing the optical quality, the allowance between the second lenticular lenses of the second lens unit can also be increased, which is beneficial to reduce the manufacturing cost.

In some embodiments, the number of the first lenticular lenses of the first lens unit 20 is equal to the number of image pixels of the multi-view stereoscopic display device 1 (for example: 1920*1080). The number of central lenticular lenses of the central lens unit 30 a is equal to the number of first lenticular lenses of the first lens unit 20 . The number of second lenticular lenses of the second lens unit 40 a is equal to the number of first lenticular lenses of the first lens unit 20 . In use, the first lenticular lens of the first lens unit 20 is towards the side close to the projection lens 112, the central lenticular lens of the central lens unit 30a and the second lenticular lens of the second lens unit 40a are Towards the side away from the projection lens 112 . Through the above configuration, the optical characteristics of each image pixel of the multi-view stereoscopic display device 1 can be adjusted separately.

It is worth noting that, observing formula (3), it can be known that as the value of Y increases, the offset O _Y increases correspondingly. In order to control the offset O _Y to be smaller than an upper limit, the projection distance TD of the image beam from the projection lens 112 to the angle magnifying screen 14a should be increased as much as possible. Preferably, the projection distance TD satisfies the following formula (4):

TD＝f _a /O _Y *W/2 (4)

Wherein, W is the width of the first lens unit 20 in a predetermined direction D.

Referring to FIG. 5 , it shows a schematic diagram of a partial structure of the angle magnification screen 14 b in some embodiments of the present invention. In this embodiment, elements identical or similar to those in FIG. 3 will be given the same reference numerals, and their features will not be described again to simplify the description.

The angle magnifying screen 14b includes a first lens unit 20 , a central lens unit 30b , and one or more second lens units 40b arranged along a main axis C in sequence. The central lens unit 30b includes a plurality of central lenticular lenses having a third focal length f _m , such as central lenticular lenses 31b, 32b, and 33b. The optical axes of the central lenticular lenses 31b, 32b, and 33b are spaced apart from each other by a third distance _PM and arranged along the predetermined direction D, wherein the optical axis of the central lenticular lens 31b is aligned on the main axis C. In this embodiment, the first focal length f _a is equal to the third focal length f _m . According to the calculation result of the above formula (1), the first pitch PA is the same as the third pitch P _{M .} The optical axes of the central lenticular lenses 31b, 32b, and 33b are aligned with the optical axes of the first lenticular lenses 21, 22, and 23, respectively.

The second lens unit 40b includes _a plurality of second lenticular lenses with a second focal length fb, such as second lenticular lenses 41b, 42b, and 43b. The optical axes of the second lenticular lenses 41b, 42b, and 43b are spaced apart from each other by a second pitch P _B and arranged along the predetermined direction D, wherein the optical axes of the second lenticular lenses 41b are aligned on the main axis C. In some embodiments, the optical axes of the second lenticular lenses 41b, 42b, and 43b pass through the positions where the image beams exit the corresponding central lenticular lenses 31b, 32b, and 33b, so as to magnify the image from the central lenticular lens. The viewing angles of the image beams of the lenses 31b, 32b, and 33b. Therefore, the second pitch P _B also satisfies the above formula (2).

In some embodiments, two adjacent second lenticular lenses are adjacent to each other, and no flat surface is formed therebetween. In some embodiments, the curvature of the second lenticular lens may vary. For example, the curvature of the region near the optical axis is greater than the curvature of the region far from the optical axis. On the other hand, as shown in FIG. 5 , the space between two adjacent second lenticular lenses 41 b , 42 b , and 43 b can be shielded by a light-shielding element 50 b to increase the image contrast.

Referring to FIG. 6 , it shows a schematic diagram of a partial structure of an angle magnification screen 14c according to some embodiments of the present invention. In this embodiment, elements identical or similar to those in FIG. 3 will be given the same reference numerals, and their features will not be described again to simplify the description. The angle magnifying screen 14c includes a first lens unit 20 , a central lens unit 30b , and one or more second lens units 40c arranged along a main axis C in sequence.

The second lens unit 40c includes a plurality of second lenticular lenses protruding toward the light emitting side and having a second focal length _fb , such as second lenticular lenses 41c, 42c, 43c, 44c, 45c, and 46c. The optical axes of the second lenticular lenses 41c, 42c, 43c, 44c, 45c, and 46c are spaced apart from each other by a second pitch P _B and arranged along the predetermined direction D, wherein the optical axes of the second lenticular lenses 41c are aligned at on spindle C. In some embodiments, the optical axes of the second lenticular lenses 41c, 43c, and 45c pass through the positions where the image beams exit the corresponding central lenticular lenses 31b, 32b, and 33b, so as to magnify the image from the central lenticular lens. The viewing angles of the image beams of the lenses 31b, 32b, and 33b. The second lenticular lens 42c is disposed between the second lenticular lenses 41c and 43c. The second lenticular lens 44c is disposed between the second lenticular lenses 43c and 45c.

It should be noted that the configuration of the second lenticular lenses 42c and 44c is used to simplify the manufacturing method of the second lens unit 40c, and the viewing angle of the image light beam from the central lens unit 30b is not conducted through the second lenticular lenses 42c and 44c. enlarge. For clarity, in the following description, the second lenticular lenses 41c, 43c, and 45c are called "functional lenses", and the second lenticular lenses 42c and 44c are called "structural lenses".

It should be understood that although the embodiment shown in FIG. 6 has only one structural lens disposed between two functional lenses, the present disclosure is not limited thereto. According to optical requirements, multiple structural lenses can be arranged between two functional lenses. Therefore, the second pitch P _B satisfies the following formula (2)':

Wherein, N is the number of structural lenses between the two functional lenses.

In some embodiments, along the predetermined direction D, counting from the next first lenticular lens (first axial lenticular lens) on the main axis C, the first lens unit 20 includes a total of X first lenticular lenses. In addition, along the predetermined direction D, counting from the next functional lens of the functional lens (second axial convex mirror lens) on the main axis, the second lens unit 40a includes a total of X functional lenses. The offset of the optical axis of the Yth functional lens and the optical axis of the Yth first convex mirror-shaped lens is to satisfy the following formula (3)':

O _Y ＝Y*[P _B *NP _A ] (3)'

Among them, Y≦X.

For example, as shown in Figure 6, along the predetermined direction D, counting from the next first lenticular lens 22 of the first lenticular lens 21 (the first axial lenticular lens), the first lens The unit 20 includes two first lenticular lenses in total. And, along the predetermined direction D, counting from the next functional lens 43c of the functional lens 41c (second axial lenticular lens), the second lens unit 40c includes two functional lenses in total. The amount of deviation O ₁ =P _B *2 _- PA of the optical axis of the first functional lens 43 c and the optical axis of the first first lenticular lens 22 . The amount of offset between the optical axis of the second second lenticular lens 45c and the optical axis of the second first lenticular lens 23 is O ₂ =2*(P _B *2 ₋ PA ), and so on.

The disclosure provides a multi-view stereoscopic display device, which uses an angle magnification screen to increase the viewing angle of an image beam from a projection lens to provide stereoscopic images in different directions for viewers at different positions in a viewing area. In some embodiments, the angle magnifying screen uses a central lens unit to replace the Fresnel lens, so as to achieve the purpose of magnifying the viewing angle without sacrificing optical quality.

Although the present disclosure has been disclosed above with specific preferred embodiments, it is not intended to limit the present disclosure. Any person skilled in the art can still make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present disclosure should be determined by what is defined by the claims.

Claims (12)

1. A kind of 1. angle enlargement screen, suitable for receiving the image strip from a projection lens, the angle enlargement screen bag Include：

   One first lens unit, including multiple first convex lens shape lens with one first focal length, are separated by one first spacing And arranged along a set direction；

   One second lens unit, including multiple second convex lens shape lens with one second focal length, are separated by one second spacing And arranged along the set direction；And

   One central lens unit, between first lens unit and second lens unit, and with first lens unit It is separated by the spacing of first focal length, wherein the central lens unit has a trifocal central convex lens shape saturating including multiple Mirror, it is separated by one the 3rd spacing and is arranged along the set direction, the 3rd spacing meets following formula：

   <mrow> <msub> <mi>P</mi> <mi>M</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>P</mi> <mi>A</mi> </msub> <mrow> <mi>T</mi> <mi>D</mi> </mrow> </mfrac> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <mi>T</mi> <mi>D</mi> <mo>+</mo> <msub> <mi>f</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>f</mi> <mi>m</mi> </msub> <mo>)</mo> </mrow> </mrow>

   Wherein, P_MFor the 3rd spacing, P_AFor first spacing, TD reaches the angle from the projection lens for the image strip and put The projector distance of giant-screen, f_aFor first focal length, f_mFor the 3rd focal length,

   Wherein second spacing meets following formula：

   <mrow> <msub> <mi>P</mi> <mi>B</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>P</mi> <mi>A</mi> </msub> <mi>N</mi> </mfrac> <mo>*</mo> <mfrac> <mrow> <mo>(</mo> <mi>T</mi> <mi>D</mi> <mo>+</mo> <msub> <mi>f</mi> <mi>a</mi> </msub> <mo>)</mo> </mrow> <mrow> <mi>T</mi> <mi>D</mi> </mrow> </mfrac> </mrow>

   Wherein, P_BFor second spacing, N is the natural number more than or equal to 1.
2. 2. angle enlargement screen as claimed in claim 1, wherein the first convex lens shape lens include one first axial convex lens Shape lens, and the second convex lens shape lens include one second axial convex lens shape lens, the light of the first axial convex lens shape lens The optical axis of axle and the second axial convex lens shape lens is co-located on a main shaft.
3. 3. angle enlargement screen as claimed in claim 2, wherein along the set direction, it is saturating from the adjacent first axial convex lens shape Another first convex lens shape lens of mirror, which count first lens unit, includes X the first convex lens shape lens, and from adjacent Another second convex lens shape lens of the second axial convex lens shape lens, which count second lens unit, includes X second convex lens Shape lens, wherein the optical axis of Y the second convex lens shape lens is inclined from the light shaft offsets one of Y the first convex lens shape lens Shifting amount, and the offset meets following formula：

   O_Y=Y* [P_B*N-P_A]

   Wherein, P_BFor second spacing, O_YFor the offset, Y is less than or equal to X, and N is the natural number more than or equal to 1.
4. 4. angle enlargement screen as claimed in claim 3, the wherein image strip reach the angle enlargement from the projection lens The projector distance of screen meets following formula：

   TD≥f_a/O_Y*W/2

   Wherein, W is first lens unit in the width on the set direction.
5. 5. angle enlargement screen as claimed in claim 1, wherein first focal length are equal to the 3rd focal length.
6. 6. angle enlargement screen as claimed in claim 1, wherein the first focal length is more than second focal length.
7. 7. angle enlargement screen as claimed in claim 1, wherein the central lens unit are separated by this with second lens unit The spacing of second focal length.
8. 8. angle enlargement screen as claimed in claim 1, in addition to multiple shading elements are arranged at adjacent two described Between two convex lens shape lens.
9. 9. angle enlargement screen as claimed in claim 1, including multiple second lens units, second lens unit is sequentially Along the set direction and connect.
10. 10. a kind of various visual angles 3 d display device, including：

    One projection lens, it is to be configured to send an image strip；And

    One angle enlargement screen, it is to be configured to the image strip of reception from the projection lens, and including：

    One first lens unit, including multiple first convex lens shape lens with one first focal length, are separated by one first spacing Along a set direction arrangement；

    One second lens unit, including multiple second convex lens shape lens with one second focal length, are separated by one second spacing Arranged along the set direction；And

    One central lens unit, between first lens unit and second lens unit, and with first lens unit It is separated by the spacing of first focal length, wherein the central lens unit has a trifocal central convex lens shape saturating including multiple Mirror, it is separated by one the 3rd spacing and is arranged along the set direction, and the 3rd spacing meets following formula：

    <mrow> <msub> <mi>P</mi> <mi>M</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>P</mi> <mi>A</mi> </msub> <mrow> <mi>T</mi> <mi>D</mi> </mrow> </mfrac> <mo>&amp;times;</mo> <mrow> <mo>(</mo> <mi>T</mi> <mi>D</mi> <mo>+</mo> <msub> <mi>f</mi> <mi>a</mi> </msub> <mo>-</mo> <msub> <mi>f</mi> <mi>m</mi> </msub> <mo>)</mo> </mrow> </mrow>

    Wherein, P_MFor the 3rd spacing, P_AFor first spacing, TD reaches the angle from the projection lens for the image strip and put The projector distance of giant-screen, f_aFor first focal length, f_mFor the 3rd focal length,

    Wherein second spacing meets following formula：

    <mrow> <msub> <mi>P</mi> <mi>B</mi> </msub> <mo>=</mo> <mfrac> <msub> <mi>P</mi> <mi>A</mi> </msub> <mi>N</mi> </mfrac> <mo>*</mo> <mfrac> <mrow> <mo>(</mo> <mi>T</mi> <mi>D</mi> <mo>+</mo> <msub> <mi>f</mi> <mi>a</mi> </msub> <mo>)</mo> </mrow> <mrow> <mi>T</mi> <mi>D</mi> </mrow> </mfrac> </mrow>

    Wherein, P_BFor second spacing, N is the natural number more than or equal to 1.
11. 11. various visual angles 3 d display device as claimed in claim 10, wherein first lens unit and the central lens list Member is one of the forming, the first convex lens shape lens towards the angle enlargement screen close to the side of the projection lens, it is and described Central convex lens shape lens are towards the side of the angle enlargement screen away from the projection lens.
12. It is saturating that 12. various visual angles 3 d display device as claimed in claim 10, wherein the angle enlargement screen include multiple second Mirror unit, second lens unit sequentially arrange along the set direction.