TWI812406B - Augmented reality device that can fine-tune sharp artificially generated images for left and right eyes separately - Google Patents

Abstract

The invention includes a shell unit, two artificial image adjustment units and a control unit. The shell unit has two perspective windows with two mutually parallel virtual optical axes between them. The user's eyes can respectively view an actual image along the two virtual optical axes and through the two perspective windows. The two artificial image adjustment units respectively correspond to two virtual optical axes. Each artificial image adjustment unit has an artificial image display part, an optical processing part, a plane reflection part, a light combining part and a focus adjustment part; the artificial image display part generates An artificial image is transmitted to the plane reflection part through the optical processing part and reflected to the light combining part, and then overlaps with the actual image along the virtual optical axis and reaches both eyes respectively. The focus adjustment part adjusts the difference between the artificial image display part and the optical processing part. distance, and the clarity of the artificial image can be adjusted separately for both eyes. This case can adjust the clarity of the artificial image for both eyes separately, does not require additional frames and lenses, can reduce weight, and does not need to accommodate users with different degrees. Changing different lenses has the advantages of wider application range.

Description

Augmented reality that can fine-tune clear artificially generated images for the left and right eyes respectively set

The present invention relates to an augmented reality device that can fine-tune the left and right eyes separately to produce clear artificially generated images. In particular, it relates to an augmented reality device that can separately adjust the clarity of artificial images for both eyes. It does not require separate frames and lenses and can reduce weight. And it is an augmented reality device that does not need to adapt to users with different degrees to change different lenses. It has a wider application range and can fine-tune clear artificially generated images for the left and right eyes respectively.

The existing augmented reality (AR, or "augmented reality") device is a technology that integrates digital information and actual information in real time. See-through near-eye display technology is a key component of AR, through which computer-generated images or videos (i.e., digital information) can be displayed on existing environmental images (i.e., actual information). Furthermore, the difference between AR and displays such as LCD and flat panel displays is that AR is a wearable device and is very close to the eyes. Therefore, not only the optical performance of the display but also the user's vision needs to be considered. According to a recent study on global myopia prevalence, it is estimated that after 2050, half of the world's population will be myopic. Current AR designs may require users with visual impairments (for example) to wear additional optical correction glasses. As a result, the user's experience of AR, or the performance of the AR device, is reduced because wearing additional optical correction glasses makes the AR device bulky and the eyes are further away from the exit pupil.

For example, the "Hololens" (Microsoft) design is not convenient for visually impaired users. The glasses are installed in a Head Mounted Display (HMD), so that the frames may be squeezed and deformed or the lenses may be scratched. And the images seen are sometimes smaller than those seen by users without glasses. This is because part of the field of view (FOV) is blocked by the frames of Hololens and glasses. Of course, users You can also choose to wear contact lenses or even an AR device similar to contact lenses. However, for the elderly, in addition to being prone to discomfort due to dry eyes, they also have low acceptance because they use less contact lenses.

With the current AR design, when a myopic user does not wear optical correction glasses, while displaying artificially generated digital images (or videos) on the actual environment image, there is no way to target the user's left eye and The degree of myopia of the right eye is determined, and the digital images are fine-tuned to match the design of the degree of myopia of the left eye and right eye respectively.

In view of this, it is necessary to develop technology that can solve the above conventional shortcomings.

The purpose of the present invention is to provide an augmented reality device that can fine-tune clear artificial images for the left and right eyes respectively. It can adjust the clarity of the artificial images for both eyes separately, does not require separate frames and lenses, and can reduce weight. , and there is no need to change different lenses to suit users with different degrees of power, and it has the advantages of a wider application range. In particular, the problem to be solved by the present invention is that with the current AR design, when a myopic user does not wear optical correction glasses, artificially generated digital images (or videos) are displayed on the actual environment image. At the same time, there is no problem of fine-tuning the digital image to match the myopia degrees of the left eye and right eye of the user respectively.

The technical means to solve the above problems is to provide an augmented reality device that can finely adjust the left and right eyes to produce clear artificially generated images, which includes: a shell unit having a first virtual optical axis, a second virtual optical axis, and a first virtual optical axis. A see-through window part, a second see-through window part and an inner space; the first virtual optical axis and the second virtual optical axis are parallel to each other, respectively used to correspond to the eyes of a user, and are linearly connected to the respective The first see-through window part, the second see-through window part and the inner space of the shell. The inner space of the shell is between the first see-through window part and the second see-through window part; so that the two eyes can respectively move along the third see-through window part. 1. The second virtual optical axis is used to view an actual image through the first perspective window part and the second perspective window part; A first artificial image adjustment unit is located in the space inside the shell. The first artificial image adjustment unit has a first artificial image display part, a first optical processing part, a first plane reflection part, a first The light combining part and a first focus adjustment part; the first artificial image display part is used to generate a first artificial image, and the first artificial image is transmitted to the first plane reflection part through the first optical processing part, and It is reflected from the first plane reflection part to the first light combining part, overlaps with the actual image at the first light combining part, and then reaches one of the eyes along the first virtual optical axis; the first focal length The adjustment part is connected to the first artificial image display part and is used to adjust the distance between the first artificial image display part and the first optical processing part, thereby adjusting the clarity of one of the two eyes viewing the first artificial image. ; A second artificial image adjustment unit is located in the space inside the shell. The second artificial image adjustment unit has a second artificial image display part, a second optical processing part, a second plane reflection part, and a first The second light combining part and a second focus adjustment part; the second artificial image display part is used to generate a second artificial image, and the second artificial image is transmitted to the second plane reflection part through the second optical processing part, And it is reflected to the second light combining part through the second plane reflecting part, and overlaps with the actual image in the second light combining part, and then reaches the other eye of the two eyes along the second virtual optical axis; The second focal length adjustment part is connected to the second artificial image display part and is used to adjust the distance between the second artificial image display part and the second optical processing part, thereby adjusting the other eye of the two eyes to view the second artificial image. The clarity; and a control unit connected to control the first artificial image display part, the first focus adjustment part, the second artificial image display part and the second focus adjustment part.

The above objects and advantages of the present invention can be easily understood from the following detailed description of selected embodiments and the accompanying drawings.

The present invention is described in detail below with the following examples and drawings:

10: Shell element

11: First perspective window part

12:Second perspective window

13: Space inside the shell

20: The first artificial image adjustment unit

21:First Artificial Image Display Department

22:First optical processing department

23: First plane reflection part

24: The first light synthesis department

25: First focus adjustment part

30: Second artificial image adjustment unit

31: Second artificial image display unit

32:Second Optical Processing Department

33: Second plane reflection part

34: The second light synthesis department

35: Second focus adjustment part

40:Control unit

50: Pupil movement detection part

51: Beam splitter

52:Detection structure

61:First polarizer

62: Second polarizer

91:User

92:Eye

M1: first virtual optical axis

M2: Second virtual optical axis

N: actual image

N1: The first artificial image

N2: Second artificial image

L0: original distance

L1: first optical distance

L2: second optical distance

Figure 1 is a schematic diagram of an embodiment of the present invention.

Figure 2A is a schematic diagram of the first corresponding relationship between the first artificial image display part and the first optical processing part of the present invention.

Figure 2B is a schematic diagram of the first corresponding relationship between the second artificial image display part and the second optical processing part of the present invention.

Figure 2C is a schematic diagram of an application example of the first (second) optical processing section in Figure 2A (2B).

Figure 3A is a schematic diagram of the second corresponding relationship between the first artificial image display part and the first optical processing part of the present invention.

Figure 3B is a schematic diagram of the second corresponding relationship between the second artificial image display part and the second optical processing part of the present invention.

Figure 3C is a schematic diagram of an application example of the first (second) optical processing section in Figure 3A (3B).

Figure 4 is a schematic diagram of the first application example of the present invention.

Figure 5 is a schematic diagram of the second application example of the present invention.

Referring to Figures 1, 2A, 2B, 2C, 3A, 3B, 3C, 4 and 5, the present invention is an augmented reality device that can finely adjust the left and right eyes to produce clear artificially generated images. It includes: a shell unit 10 having a first virtual optical axis M1, a second virtual optical axis M2, a first see-through window part 11, a second see-through window part 12 and an inner space 13 of the shell. The first virtual optical axis M1 and the second virtual optical axis M2 are parallel to each other, respectively used to correspond to both eyes 92 of a user 91 , and linearly connected to the first perspective window portion 11 and the second perspective window portion respectively. 12 and the inner space 13 of the shell. The inner space 13 is between the first see-through window part 11 and the second see-through window part 12 . The two eyes 92 can view an actual image N through the first see-through window portion 11 and the second see-through window portion 12 along the first and second virtual optical axes M1 and M2 respectively.

A first artificial image adjustment unit 20 is located in the inner space 13 of the housing. The first artificial image adjustment unit 20 has a first artificial image display part 21, a first optical processing part 22, and a first plane reflection part 23, a first light combining part 24 and a first focus adjustment part 25. The first artificial image display part 21 is used to generate a first artificial image N1. The first artificial image N1 is transmitted to the first plane reflection part 23 through the first optical processing part 22 and reflected by the first plane. 23 is reflected to the first light combining part 24, and overlaps with the actual image N in the first light combining part 24, and then reaches one of the two eyes 92 along the first virtual optical axis M1. The first focus adjustment part 25 is connected to the first artificial image display part 21 and is used to adjust the distance between the first artificial image display part 21 and the first optical processing part 22 , thereby adjusting one of the two eyes 92 View the clarity of the first artificial image N1.

A second artificial image adjustment unit 30 is located in the inner space 13 of the housing. The second artificial image adjustment unit 30 has a second artificial image display part 31, a second optical processing part 32, and a second plane The reflective part 33 , a second light combining part 34 and a second focus adjustment part 35 . The second artificial image display part 31 is used to generate a second artificial image N2. The second artificial image N2 is transmitted to the second plane reflection part 33 through the second optical processing part 32 and reflected by the second plane. The part 33 is reflected to the second light combining part 34, and overlaps with the actual image N in the second light combining part 34, and then reaches the other eye of the two eyes 92 along the second virtual optical axis M2. The second focal length adjustment part 35 is connected to the second artificial image display part 31 and is used to adjust the distance between the second artificial image display part 31 and the second optical processing part 32, thereby adjusting the other of the two eyes 92. The clarity of the second artificial image N2 is visually viewed.

A control unit 40 is connected to control the first artificial image display part 21 , the first focus adjustment part 25 , the second artificial image display part 31 and the second focus adjustment part 35 .

Practically, referring to Figures 2A and 2C, regarding the first corresponding relationship between the first artificial image display part 21 and the first optical processing part 22: the first artificial image display part 21 is provided on the first optical processing part 21. between the processing part 22 and the first plane reflection part 23.

The first optical processing part 22 may be a parabolic mirror structure.

Referring to Figures 2B and 2C, regarding the first corresponding relationship between the second artificial image display part 31 and the second optical processing part 32: the second artificial image display part 31 is provided in the second optical processing part 32 and the second plane reflecting part 33 .

The second optical processing part 32 may be a parabolic mirror structure.

Referring to Figures 3A and 3C, regarding the second corresponding relationship between the first artificial image display part 21 and the first optical processing part 22: the first optical processing part 22 is provided in the first artificial image display part 21 and the first plane reflection part 23 .

The first optical processing part 22 may be a combination device of a parabolic mirror structure and a hyperbolic mirror structure.

Referring to Figures 3B and 3C, regarding the second corresponding relationship between the second artificial image display part 31 and the second optical processing part 32: the second optical processing part 32 is provided in the second artificial image display part 31 and the second plane reflecting part 33 .

The second optical processing part 32 may be a combination device of a parabolic mirror structure and a hyperbolic mirror structure.

In addition, the first plane reflection part 23 may be a plane mirror structure.

The first light combining part 24 may be a light combining mirror structure.

The second plane reflection part 33 may be a plane mirror structure.

The second light combining part 34 may be a light combining mirror structure.

Furthermore, this case may further include (as shown in Figures 1, 2A and 3A): at least one pupil movement detection part 50, which is installed in the inner space 13 of the shell and is electrically connected to the control unit 40. The at least one pupil movement detection part 50 is A pupil movement detection part 50 includes a beam splitter 51 and a detection structure 52 .

The spectroscope 51 is disposed on at least one of the first virtual optical axis M1 and the second virtual optical axis M2 to reflect the pupil image of the eye corresponding to the two eyes 92 to the detection structure. 52. The detection structure 52 receives the pupil image and is used to determine the movement direction of the eye. Furthermore, one of the first artificial image N1 and the second artificial image N2 is controlled to move along with the movement direction of the eye (which can improve the visual field).

A first polarizer 61 is disposed in the inner space 13 of the casing and is coaxial with the first virtual optical axis M1; a second polarizer 62 is disposed in the inner space 13 of the casing and is coaxial with the second virtual optical axis M1. The axis M2 is coaxial, and the polarization direction of the second polarizer 62 is 90 degrees different from that of the first polarizer 61 .

Thereby, the first artificial image N1 passes through the first polarizer 61 and reaches one of the two eyes 92; the second artificial image N2 passes through the second polarizer 62 and reaches one of the two eyes 92. One of the two eyes 92 is used to produce a three-dimensional image effect.

What needs special explanation here is that because the eyes 92 pass through the first and second see-through window portions 11 and 12 (the first and second light combining portions 24 and 34 do not affect the actual image N ) directly sees through the external scenery (that is, the actual image N), so the field of view of the external scenery is not affected by the reflective mirror group (that is, the first artificial image adjustment unit 20 and the second artificial image adjustment unit 30).

However, the path of the artificial image (i.e., the first artificial image N1 and the second artificial image N2) will be limited by the field of view of the reflective lens group. Therefore, when using the eye position tracking device (i.e., the at least one pupil movement detection unit 50), the horizontal movement direction of the eyeballs (for example, the pupil image of the two eyes 92) can be tracked, and then the control unit 40 can adjust the screen movement of the artificial image in real time according to the eyeball movement, thereby increasing the visible screen range.

The key point of this case is that when applied to the user 91 with visual impairment, the user 91 does not need to wear additional optical correction glasses. Because this case is aimed at this part, it has the following design:

[a] First focus adjustment section 25 . Referring to Figure 2A, the first artificial image adjustment part 20 is provided with the first focus adjustment part 25, which is connected to the first artificial image display part 21 and the control unit 40.

Assuming that there is an original distance L0 between the first artificial image display part 21 and the first optical processing part 22, the power corresponding to one of the two eyes 92 can be adjusted to a first through the first focus adjustment part 25. An optical distance L1 (equivalent to adjusting the focal length) enables one of the two eyes 92 to clearly see (improve clarity) the first artificial image N1.

[b] Second focus adjustment unit 35. Referring to Figure 2B, the second artificial image adjustment part 30 is provided with the second focus adjustment part 35, which is connected to the second artificial image display part 31 and the control unit 40.

Assuming that there is an original distance L0 between the second artificial image display part 31 and the second optical processing part 32 , which is also the power corresponding to the other eye of the two eyes 92 , and can be adjusted to a distance L0 through the second focus adjustment part 35 The second optical distance L2 (equivalent to adjusting the focal length) enables the other eye of the two eyes 92 to clearly see (improve the clarity) the second artificial image N2.

In particular, there is no need to add other frames or optical lenses, and there is no need to change optical lenses of different powers for different users 91 (some people are highly myopic), which greatly improves convenience and acceptance.

Regarding the optical focusing part of this case, for example, the control unit 40 can build in the following (Formula 1) and (Formula 2): X*X'=f ² (Formula 1)

D=1/(X') (Formula 2)

Among them: f represents the focal length of the lens group (for example, 20mm).

X is the display movement distance (such as the first optical distance L1 or the second optical distance L2).

When the units of X and X’ are meters, then D*100 is the degree.

Further information can be obtained (Table 1):

The advantages and effects of this case can be summarized as follows:

[1] The sharpness of the artificial images of both eyes can be adjusted separately. Taking the first artificial image adjustment part corresponding to one of the two eyes as an example, it is provided with the first focus adjustment part, and the first focus adjustment part is connected to the first artificial image display part and the control unit. Assuming that there is an original distance between the first artificial image display part and the first optical processing part, the power corresponding to one of the two eyes can be adjusted to a first optical distance (also That is, focusing) so that one of the two eyes can clearly see (improve the clarity) the first artificial image. As for the other eye of the two eyes, it corresponds to the second artificial image adjustment part. The adjustment method is the same and will not be described again. Therefore, the sharpness of the artificial images of both eyes can be adjusted separately.

[2] There is no need to install additional frames and lenses to reduce weight. In this case, as long as the distance between the corresponding artificial image display part and the optical processing part is adjusted, the clarity of the artificial image can be adjusted and improved. There is no need to install additional frames and lenses, which effectively reduces the weight. Therefore, there is no need to install separate frames and lenses, which can reduce weight.

[3] There is no need to change different lenses to accommodate users with different powers. It has a wider application range. This case does not use optical lenses to adjust the clarity of artificial images, so there is no need to change different lenses to suit different users (especially some users with high myopia, the lenses must be customized and are not easy to obtain). Therefore, there is no need to change different lenses to suit users with different powers, and the application range is wider.

The above is only a detailed description of the present invention through preferred embodiments. Any simple modifications and changes made to the embodiments do not deviate from the spirit and scope of the present invention.

10: Shell element

11: First perspective window part

12:Second perspective window

20: The first artificial image adjustment unit

21:First Artificial Image Display Department

22:First optical processing department

23: First plane reflection part

24: The first light synthesis department

25: First focus adjustment part

30: Second artificial image adjustment unit

31: Second artificial image display unit

32:Second Optical Processing Department

33: Second plane reflection part

34: The second light synthesis department

35: Second focus adjustment part

40:Control unit

50: Pupil movement detection part

51: Beam splitter

52:Detection structure

92:Eye

M1: first virtual optical axis

M2: Second virtual optical axis

N: actual image

N1: The first artificial image

N2: Second artificial image

Claims (8)

An augmented reality device that can fine-tune clear artificially generated images for left and right eyes respectively, including: a shell unit having a first virtual optical axis, a second virtual optical axis, a first perspective window, and a second A see-through window and an inner space; the first virtual optical axis and the second virtual optical axis are parallel to each other, respectively used to correspond to the eyes of a user, and linearly connected to the first see-through window and the third Two see-through window parts and the inner space of the shell, the inner space of the shell is between the first see-through window part and the second see-through window part; so that the two eyes can respectively move along the first and second virtual optical axes , watch an actual image through the first perspective window part and the second perspective window part; a first artificial image adjustment unit is located in the space inside the shell, and the first artificial image adjustment unit has a first artificial image adjustment unit. An image display part, a first optical processing part, a first plane reflection part, a first light combining part and a first focus adjustment part; the first artificial image display part is used to generate a first artificial image, the The first artificial image is transmitted to the first planar reflection part through the first optical processing part, and is reflected to the first light combining part through the first planar reflection part, and overlaps with the actual image in the first light combining part , and then reaches one of the two eyes along the first virtual optical axis; the first focus adjustment part is connected to the first artificial image display part for adjusting the first artificial image display part and the first optical processing part distance between them, thereby adjusting the clarity of one of the two eyes viewing the first artificial image; a second artificial image adjustment unit is located in the space inside the shell, and the second artificial image adjustment unit has a second artificial image adjustment unit. An artificial image display part, a second optical processing part, a second plane reflection part, a second light combining part and a second focus adjustment part; the second artificial image display part is used to generate a second artificial image, The second artificial image is transmitted to the second planar reflection part through the second optical processing part, and is reflected to the second light combining part through the second planar reflection part, and between the second light combining part and the actual image Overlap, and then reach the other eye of the two eyes along the second virtual optical axis; the second focus adjustment part is connected to the second person An artificial image display part used to adjust the distance between the second artificial image display part and the second optical processing part, thereby adjusting the clarity of the second artificial image viewed by the other eye of the two eyes; and a control unit, is connected to control the first artificial image display part, the first focus adjustment part, the second artificial image display part and the second focus adjustment part; wherein: the first artificial image display part is provided in the third Between an optical processing part and the first plane reflection part; the first optical processing part is a parabolic mirror structure; the second artificial image display part is provided between the second optical processing part and the second plane reflection part time; and the second optical processing part is a parabolic mirror structure. The augmented reality device as described in claim 1 that can fine-tune clear artificially generated images for left and right eyes respectively, wherein: the first plane reflection part is a plane reflector structure: the first light combining part is a light combining mirror structure ; The second plane reflecting part is a plane reflecting mirror structure; and the second light combining part is a light combining mirror structure. The augmented reality device described in claim 1 that can fine-tune clear artificially generated images for left and right eyes respectively, further comprising: at least one pupil movement detection unit, which is located in the space inside the shell and is electrically connected to the control unit , the pupil movement detection unit includes a spectroscope and a detection structure; and the spectroscope is disposed on at least one of the first virtual optical axis and the second virtual optical axis to separate the two eyes. The corresponding image of the eye is reflected to the detection structure to determine the movement direction of the eye. Then, one of the first artificial image and the second artificial image is controlled to move along with the moving direction of the eye. The augmented reality device described in claim 1 that can fine-tune clear artificially generated images for left and right eyes respectively, further includes: a first polarizer located on the first virtual optical axis; and a second polarizer , is located on the second virtual optical axis, and the polarization direction of the second polarizer is 90 degrees different from that of the first polarizer; thereby, the first artificial image passes through the first polarizer and reaches the One of the two eyes; and the second artificial image passes through the second polarizer and reaches the other eye of the two eyes, thereby producing a three-dimensional image effect. An augmented reality device that can fine-tune clear artificially generated images for left and right eyes respectively, including: a shell unit having a first virtual optical axis, a second virtual optical axis, a first perspective window, and a second A see-through window and an inner space; the first virtual optical axis and the second virtual optical axis are parallel to each other, respectively used to correspond to the eyes of a user, and linearly connected to the first see-through window and the third Two see-through window parts and the inner space of the shell, the inner space of the shell is between the first see-through window part and the second see-through window part; so that the two eyes can respectively move along the first and second virtual optical axes , watch an actual image through the first perspective window part and the second perspective window part; a first artificial image adjustment unit is located in the space inside the shell, and the first artificial image adjustment unit has a first artificial image adjustment unit. An image display part, a first optical processing part, a first plane reflection part, a first light combining part and a first focus adjustment part; the first artificial image display part is used to generate a first artificial image, the The first artificial image is transmitted to the first planar reflection part through the first optical processing part, and is reflected to the first light combining part through the first planar reflection part, and overlaps with the actual image in the first light combining part ,Again Arriving at one of the two eyes along the first virtual optical axis; the first focus adjustment part is connected to the first artificial image display part for adjusting the relationship between the first artificial image display part and the first optical processing part distance, thereby adjusting the clarity of one of the two eyes viewing the first artificial image; a second artificial image adjustment unit is located in the space inside the shell, and the second artificial image adjustment unit has a second artificial image A display part, a second optical processing part, a second plane reflection part, a second light combining part and a second focus adjustment part; the second artificial image display part is used to generate a second artificial image, and the second artificial image display part is used to generate a second artificial image. The two artificial images are transmitted to the second planar reflection part through the second optical processing part, and are reflected to the second light combining part through the second planar reflection part, and overlap with the actual image in the second light combining part, Then it reaches the other eye of the two eyes along the second virtual optical axis; the second focus adjustment part is connected to the second artificial image display part for adjusting the second artificial image display part and the second optical processing part distance between them, thereby adjusting the clarity of the second artificial image viewed by the other eye of the two eyes; and a control unit connected to control the first artificial image display part, the first focus adjustment part, and the The second artificial image display part and the second focus adjustment part; wherein: the first optical processing part is provided between the first artificial image display part and the first plane reflection part; the first optical processing part is A combined device of a parabolic mirror structure and a hyperbolic mirror structure; the second optical processing part is disposed between the second artificial image display part and the second plane reflection part; and the second optical processing part is a parabolic mirror structure and a combined device with a hyperboloid mirror structure. As claimed in claim 5, the augmented reality device capable of fine-tuning clear artificially generated images for left and right eyes respectively, wherein: the first plane reflecting part is a plane reflecting mirror structure: the first light combining part is a light combining mirror structure ; The second plane reflecting part is a plane reflecting mirror structure; and the second light combining part is a light combining mirror structure. The augmented reality device described in claim 5 that can fine-tune clear artificially generated images for left and right eyes respectively, further comprising: at least one pupil movement detection unit, which is located in the space inside the shell and is electrically connected to the control unit , the pupil movement detection unit includes a spectroscope and a detection structure; and the spectroscope is disposed on at least one of the first virtual optical axis and the second virtual optical axis to separate the two eyes. The corresponding image of the eye is reflected to the detection structure to determine the moving direction of the eye, and then controls one of the first artificial image and the second artificial image to move along with the moving direction of the eye. The augmented reality device described in claim 5 that can fine-tune clear artificially generated images for left and right eyes respectively, further includes: a first polarizer disposed on the first virtual optical axis; and a second polarizer , is located on the second virtual optical axis, and the polarization direction of the second polarizer is 90 degrees different from that of the first polarizer; thereby, the first artificial image passes through the first polarizer and reaches the One of the two eyes; and the second artificial image passes through the second polarizer and reaches the other eye of the two eyes, thereby producing a three-dimensional image effect.

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