Optical display device and ar display device

Abstract

The application relates to the field of optical devices, and discloses an optical display device and an AR display device, which comprises an image source, a first triangular prism, a second triangular prism and a first lens; wherein the image source is arranged on one side of a first surface of the first triangular prism, and the first lens is arranged on a second surface of the first triangular prism; a first surface of the second triangular prism is arranged on a third surface of the first triangular prism; the first surface of the first triangular prism is close to one side of a human eye of a wearer; and a first semi-transparent and semi-reflective film is arranged on a surface of the first lens which is away from the first triangular prism. The optical display device provided in the application has a simple structure, and the overall display device size is relatively small, so that the light weight of the optical display device is realized to a certain extent, and the wide application of the device is facilitated.

Description

Technical Field

[0001] This invention relates to the field of optical devices, and in particular to an optical display device and an AR display device. Background Technology

[0002] AR display technology, or virtual reality display technology, uses optical elements to overlay virtual and real images. Currently, optical devices for AR display technology can be broadly classified into two types. One type uses a projection optical engine to project projection light into an optical waveguide, where it undergoes total internal reflection before being output to the human eye. Simultaneously, ambient light can also be projected through the waveguide to the human eye, thus achieving the overlay of virtual and real images. The other type uses geometric optical elements to transmit projection light to the human eye, while ambient light can also be projected through these elements to reach the human eye, achieving the same virtual reality overlay display.

[0003] In display devices that utilize geometric optical elements to realize AR display technology, how to achieve lightweight device structure is one of the hot research directions in the industry. Summary of the Invention

[0004] The purpose of this invention is to provide an optical display device and an AR display device, which have a simple structure and achieve a certain degree of lightweighting of the overall structure.

[0005] To solve the above-mentioned technical problems, the present invention provides an optical display device, comprising: an image source, a first prism, a second prism, and a first lens;

[0006] The image source is disposed on one side of the first surface of the first prism, and the first lens is disposed in conjunction with the second surface of the first prism; the first surface of the second prism is disposed in conjunction with the third surface of the first prism; both the first and third surfaces of the first prism are located on the side of the second prism closer to the wearer's eye, and the second surface of the first prism is located on the side of the second prism away from the wearer's eye; a first semi-transparent and semi-reflective film is disposed on the surface of the first lens away from the first prism.

[0007] The included angle α between the second and third surfaces of the first prism satisfies 15° < a < 35°; the included angle b between the first and second surfaces of the second prism satisfies 15° < b < 25°; and ab ≤ 10°, and the second surface of the second prism is the surface on the side that outputs the projected light.

[0008] The projected light from the image source is incident on the first prism through the first surface of the first prism, and then sequentially undergoes total internal reflection through the second surface of the first prism, reflection through the third surface of the first prism, transmission through the second surface of the first prism to the first lens, and reflection through the first semi-transparent and semi-reflective film. Finally, it is transmitted through the second and third surfaces of the first prism and the second prism to the human eye.

[0009] Optionally, a polarizing film is provided on the third surface of the first prism; a quarter-wave plate is provided between the first lens and the polarizing film;

[0010] Alternatively, a second semi-transparent and semi-reflective film may be provided on the third surface of the first prism.

[0011] Optionally, both the first prism and the second prism are prisms with a refractive index of 1.45 to 1.75 and an Abbe number of 18.0 to 60.0.

[0012] The first lens has a focal length f1 satisfying 10mm≤f1≤25mm, a refractive index of 1.45~1.90, an Abbe number of 35.0~85.0, a radius of curvature R11 of the first surface satisfying R11≥100mm or R11≤-100mm, and a radius of curvature R12 of the second surface satisfying 40mm≤R12≤80mm; wherein, the first surface of the first lens is the surface closer to the first prism; and the second surface of the first lens is the surface away from the first prism.

[0013] The gap between the first surface of the first lens and the second surface of the first prism is 0.01 mm to 1.0 mm.

[0014] Optionally, a second lens is further disposed between the image source and the first surface of the first prism.

[0015] Optionally, the focal length f2 of the second lens satisfies f2≥50mm or f2≤-50mm, the refractive index is 1.45~1.90, the Abbe number is 35.0~85.0, and the radius of curvature R21 of the first surface and the radius of curvature R22 of the second surface satisfy |R21-R22|>50mm; wherein, the first surface of the second lens is the surface facing away from the first prism body; the second surface of the second lens is the surface close to the first prism body;

[0016] The gap between the first surface of the second lens and the first surface of the first prism is 0.05 mm to 3.0 mm.

[0017] Optionally, a third lens is further provided on one side of the second surface of the second triangular prism; wherein the second surface of the second triangular prism is the surface from which the projected light is transmitted and output.

[0018] Optionally, the focal length f3 of the third lens satisfies f3≥50mm or f3≤-50mm, the refractive index is 1.45~1.90, the Abbe number is 35.0~85.0, the radius of curvature R31 of the first surface satisfies R31≥100mm or R31≤-100mm, and the radius of curvature R32 of the second surface satisfies R32≥100mm or R32≤-100mm; wherein, the first surface of the third lens is the surface closer to the second triangular prism body; and the second surface of the third lens is the surface away from the second triangular prism body.

[0019] An AR display device, comprising the optical display device as described in any of the preceding claims.

[0020] The present invention provides an optical display device and an AR display device. The optical display device includes: an image source, a first prism, a second prism, and a first lens; wherein the image source is disposed on one side of the first surface of the first prism, and the first lens is disposed against the second surface of the first prism; the first surface of the second prism is disposed against the third surface of the first prism; both the first and third surfaces of the first prism are located on the side of the second prism closest to the wearer's eye, and the second surface of the first prism is located on the side of the second prism away from the wearer's eye; a first semi-transparent and semi-reflective film is disposed on the surface of the first lens away from the first prism; the first prism's first... The included angle α between the second and third surfaces satisfies 15° < a < 35°; the included angle b between the first and second surfaces of the second prism satisfies 15° < b < 25°; and ab ≤ 10°. The second surface of the second prism is the surface on the side that outputs the projected light. The projected light output from the image source enters the first prism through the first surface of the first prism, and then passes through the total internal reflection of the second surface of the first prism, the reflection of the third surface of the first prism, the transmission through the second surface of the first prism to the first lens, and after being reflected by the first semi-transparent and semi-reflective film, it passes through the second and third surfaces of the first prism and the transmission through the second prism to be output to the human eye.

[0021] In the optical display device provided in this application, the projection light output from the image source is repeatedly reflected within the first prism through the cooperation between the first prism and the first lens. This allows the transmission optical path of the projection light to be repeatedly folded within the first prism, providing a sufficiently long transmission optical path. Furthermore, the projection light only needs to undergo two reflections within the first prism, ensuring a sufficient optical path while avoiding excessive reflections that would lead to an overly large first prism size, thus contributing to a lightweight overall display device structure. In addition, because the first surface of the first prism is closer to the wearer's eye, and the image source outputs projection light to the first surface of the first prism, the image source is located on the side of the first prism closer to the wearer's head, facilitating image source installation and simplifying the installation structure. The optical display device provided in this application has a simple structure and a relatively small overall size, achieving a certain degree of lightweighting and facilitating its widespread application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an optical display device provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of another optical display device provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of another optical display device provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure of another optical display device provided in an embodiment of this application. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 4 As shown, Figure 1 This is a schematic diagram of the structure of an optical display device provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of another optical display device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of another optical display device provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of another optical display device provided in an embodiment of this application.

[0029] In one specific embodiment of this application, the optical display device may include:

[0030] Image source 1, first prism 2, second prism 3, first lens 4;

[0031] The image source 1 is located on one side of the first surface 201 of the first triangular prism 2, and the first lens 4 is attached to the second surface 202 of the first triangular prism 2. The first surface of the second triangular prism is attached to the third surface 203 of the first triangular prism 2. The first surface 201 and the third surface 203 of the first triangular prism 2 are both located on the side of the second triangular prism 3 closest to the wearer's eye, and the second surface 202 of the first triangular prism 2 is located on the side of the second triangular prism 3 away from the wearer's eye. A first semi-transparent and semi-reflective film is provided on the surface of the first lens 4 away from the first triangular prism 2.

[0032] The included angle α between the second surface 201 and the third surface 203 of the first triangular prism 2 satisfies 15° < a < 35°; the included angle b between the first surface 301 and the second surface 302 of the second triangular prism 3 satisfies 15° < b < 25°; and ab ≤ 10°, and the second surface 302 of the second triangular prism 3 is the surface on the side that outputs the projected light.

[0033] The projected light from image source 1 is incident into the first triangular prism 2 through the first surface 201, and then sequentially undergoes total internal reflection through the second surface 202 of the first triangular prism 2, reflection through the third surface 203 of the first triangular prism 2, transmission through the second surface 202 of the first triangular prism 2 to the first lens 4, and after reflection through the first semi-transparent and semi-reflective film, it is transmitted through the second surface 202 and the third surface 203 of the first triangular prism 2 and the second triangular prism 3 before being output and incident into the human eye.

[0034] Reference Figure 1 ,exist Figure 1In the illustrated embodiment, the projection light output from image source 1 first passes through the first surface 201 of the first prism 2 and enters the first prism 2. After total internal reflection at the second surface 202 of the first prism 2, it enters the third surface 203 of the first prism 2. Because a polarizing film is provided on the third surface 203 of the first prism 2, the polarizing film partially reflects the projection light, and the reflected projection light is polarized light. This polarized light is transmitted again to one side of the second surface 202 of the first prism 2, and after being transmitted through the second surface 202 of the first prism 2, it passes through the quarter-wave plate 5 for the first time, and then enters the first lens 4 through the first surface 401 of the first lens 4. The semi-transparent and semi-reflective film on the second surface 402 of the mirror 4 reflects the polarized light, causing it to pass through the first surface 401 and the quarter-wave plate 5 of the first lens 4 a second time and be incident on the first triangular prism 2. Because the polarized light passes through the quarter-wave plate 5 twice, the polarization direction changes. When the polarized light is incident on the third surface 203 of the first triangular prism 2, which is provided with a polarizing film, it can be directly transmitted. Thus, the polarized light can be transmitted through the second surface 202 and the third surface 203 of the first triangular prism 2 in sequence and then be incident on the second triangular prism 3. After being transmitted through the second triangular prism 3, it is output to the aperture 100. The aperture 100 is the position of the human eye. That is to say, the light transmitted through the second triangular prism 3 can be incident on the human eye.

[0035] When light reflected from the polarizing film to the first semi-transparent and semi-reflective film is reflected back to the polarizing film, it needs to be able to pass through the polarizing film. Therefore, a device that can change the polarization state of light needs to be placed between the polarizing film and the first semi-transparent and semi-reflective film. When the light passes through the device twice, the polarization state changes from being able to be reflected by the polarizing film to being able to pass through the polarizing film. In this embodiment, a quarter-wave plate 5 is used to achieve this function. According to the above principle, the quarter-wave plate 5 needs to be placed between the polarizing film and the first semi-transparent and semi-reflective film. In actual use, the quarter-wave plate 5 can be attached to the polarizing film or the first semi-transparent and semi-reflective film, or it can be placed between the first lens 4 and the first prism 2 or on one of the surfaces adjacent to them.

[0036] exist Figure 1In the illustrated embodiment, to ensure that the projected light undergoes partial transmission and partial reflection when it first incident on the third surface of the first prism 2, a polarizing film is provided on the third surface 203 of the first prism 2, and a quarter-wave plate 5 is provided between the polarizing film and the first semi-transparent and semi-reflective film. However, in practical applications, it is not necessarily required to provide a polarizing film on the third surface 203 of the first prism 2, nor is it necessary to provide a quarter-wave plate 5 between the polarizing film and the first semi-transparent and semi-reflective film. In another optional embodiment of this application, a second semi-transparent and semi-reflective film can also be provided on the third surface 203 of the first prism 2. In this case, it is not necessary to provide a quarter-wave plate 5, and the projected light can still undergo partial reflection and partial transmission when passing through the third surface 203 of the first prism 2.

[0037] Furthermore, the third surface 203 of the first prism 2 has the function of partially reflecting and partially transmitting incident light. The ratio of reflection to transmission depends on the angle of the incident light. Therefore, in practical applications, it is also possible to consider not setting a polarizing film or a second semi-transparent and semi-reflective film on the third surface 203 of the first prism 2.

[0038] Reference Figure 1 As can be seen from the embodiment shown, in this embodiment, the first surface 201 and the third surface 203 of the first triangular prism 2 are both located on the side of the second triangular prism 3 closer to the wearer's eye, and the second surface 202 of the first triangular prism 2 is located on the side of the second triangular prism 3 away from the wearer's eye. Since the image source 1 outputs projected light to the first surface 201 of the first triangular prism 2, the image source 1 is also located on the side of the first triangular prism 2 closer to the wearer's eye. Compared to the image source 1 being located on the side of the first triangular prism 2 away from the wearer's eye, the image source 1 in this embodiment is easier to install, which helps to reduce the complexity of the installation structure of the image source 1.

[0039] Furthermore, in this embodiment, the projected light rays are reflected only twice after entering the first prism 2. This ensures sufficient optical path for the projected light rays while avoiding excessive reflections that could lead to an overly large first prism 2. Moreover, because the projected light rays in this application are reflected only twice within the first prism 2, the divergence of the projected light rays transmitted through the first prism 2 is not excessive. Therefore, this embodiment can select an image source 1 capable of outputting a larger area of ​​projected light rays, meaning it can output projected light rays capable of outputting a larger area of ​​image. This ensures that the image formed by the projected light rays after being transmitted through the first prism 2, the second prism 3, and the first lens 4 is sufficiently large, and that image distortion due to divergence is minimized, thereby ensuring a good display effect. Therefore, in practical applications, the luminous surface area of ​​the image source 1 outputting the projected light rays can be set to be no less than a certain predetermined area.

[0040] Furthermore, the structural shapes of the first triangular prism 2 and the second triangular prism 3 directly affect the spatial volume occupied by the entire optical display device and the imaging effect.

[0041] For the first prism 2, if the included angle α between the second surface 201 and the third surface 203 is too large or too small, it will not meet the requirement that the projected light rays be reflected twice within the first prism 2 before exiting. If the included angle α is too small, the projected light rays output from the image source 1 will be reflected multiple times within the first prism 2, or the requirement of total internal reflection on the second surface 201 of the first prism 2 may not be met. If the included angle α is too large, the projected light rays output from the image source 1 will only be reflected once within the first prism 2 before exiting, failing to meet the requirement of two reflections. Therefore, in this embodiment, the included angle α of the first prism 2 is within the range of (15°, 35°), which ensures that the projected light rays output from the image source 1 are reflected twice within the first prism 2.

[0042] The main function of the second prism 3 is to compensate for the optical path difference caused by the repeated reflections of the projected light rays from different light-emitting positions on the image source 1 within the first prism 1. If the angle b between the first surface 301 and the second surface 302 of the second prism 3 is too small, it will not be able to compensate for the optical path difference. If the angle b is too large, it will lead to overcompensation of the optical path difference, causing additional reverse optical path differences, resulting in significant image distortion and affecting the actual imaging quality. Therefore, in this embodiment, to ensure the compensation effect on the projected light rays and to ensure the imaging quality of the projected light rays, the angle b is set to satisfy 15° < b < 25°, and ab ≤ 10°.

[0043] The first lens 4 in this embodiment can reflect the projected light and correct aberrations.

[0044] In addition, according to Figures 1 to 4 As can be seen from the embodiment shown, the optical path of the projected light output from different positions on the image source 1 after being reflected by the two surfaces of the first triangular prism 2 is different. Therefore, in this embodiment, a second triangular prism 3 is further attached to one side of the third surface 203 of the first triangular prism 2 to adjust the optical path of the light output from different positions, so that the optical path of the projected light in each part is basically the same, thereby reducing image distortion and ensuring the display effect of the projected image.

[0045] exist Figures 1 to 4 In the embodiments shown, the first surface 201, the second surface 202, and the third surface 203 of the first triangular prism 2 are planes, and the first surface 301 and the second surface 302 of the second triangular prism 3 are also planes. However, in practical applications, the first surface 201, the second surface 201, and the third surface 201 of the first triangular prism 2 are not necessarily planes, but can be curved surfaces with aberration correction functions. Similarly, the first surface 301 and the second surface 302 of the second triangular prism 3 can also be curved surfaces, which will not be elaborated further in this application.

[0046] In addition, to further improve the display effect of the projected image on the entire optical display device, such as Figure 2 As shown, in another optional embodiment of this application, a second lens 6 may be further disposed between the image source 1 and the first surface 201 of the first prism 2. This second lens 6 can further eliminate aberrations in the projected light.

[0047] Of course, eliminating aberrations in projected light is not limited to the method described above. For example... Figure 3 As shown, in another optional embodiment of this application, a third lens 7 may be further provided on the side of the second prism 3 that outputs the projected light (the side of the second surface 302 of the second prism 3), that is, the side closer to the human eye.

[0048] In addition, such as Figure 4 As shown, in practical applications, in addition to setting a second lens 6 between the image source 1 and the first prism 2, a third lens 7 can be further set on the side of the second prism 3 closer to the human eye, which can also achieve the technical solution in this application.

[0049] Based on the above discussion, and further considering that wearers of optical display devices may have myopia during actual use, and that the degree of myopia may vary among different wearers, in another optional embodiment of this application, the following may be further included:

[0050] The relative distance between the image source 1 and the first surface 201 of the first prism 2 is adjustable; and the change in relative distance is less than 2.5 mm.

[0051] By changing the different positions between the image source 1 and the first surface 201 of the first prism 2, the different imaging positions of the projected light can be changed, thereby adapting to wearers with different myopia degrees; that is to say, in this embodiment, by changing the relative distance between the image source 1 and the first surface 201 of the first prism 2, the diopter of the entire optical display device can be changed.

[0052] In practical applications, if the image source 1 moves too far relative to the first surface of the first prism 2, the boundary of the image source 1 closest to the human eye will be closer to the human eye than the second surface 302 of the second prism 3. Since the image source 1 generates significant heat during operation, this proximity to the human eye can cause discomfort. Furthermore, because the image source 1 moves too far, a large space needs to be reserved for its movement, resulting in a larger overall size of the optical display device, which can also cause discomfort. This can lead to severe image distortion and FOV reduction; when moved to the edge of the range, the edges of the displayed image may not be completely clear, making it difficult to ensure image quality. The maximum movement of the image source 1 relative to the first surface of the first prism 2 can be equal to 2.5mm, meaning that a movement range of 0 to 2.5mm is sufficient to allow the refractive power of the entire optical display device to be adjusted within the 0D-6D range, thereby reducing image distortion and FOV reduction to a certain extent and improving image display quality.

[0053] In the embodiment where a second lens 6 is provided between the image source 1 and the first surface 201 of the first prism 2, the diopter can also be changed by moving the distance between the image source 1 and the first prism 2. However, the diopter can also be changed by moving the second lens 6 relative to the first prism 2 or by moving the image source 1 and the second lens 6 simultaneously. This embodiment does not impose any restrictions on this.

[0054] For optical display devices that include a third lens 7, the diopter of the entire optical display device can also be changed by moving the distance between the third lens 7 and the second surface 302 of the second prism 3. This will not be described in detail in this embodiment.

[0055] To further introduce the optical display device of this application, the specific structural parameters of each optical element are described below.

[0056] In one specific embodiment of this application, the included angle α between the second surface 202 and the third surface 203 of the first triangular prism 2 satisfies 15° < a < 35°; the included angle b between the first surface 301 and the second surface 302 of the second triangular prism 3 satisfies 15° < b < 25°; and ab ≤ 10°, wherein the second surface 302 of the second triangular prism 3 is the surface on the side that outputs the projected light.

[0057] In addition, both the first triangular prism 2 and the second triangular prism 3 can be prisms with a refractive index of 1.45 to 1.75 and an Abbe number of 18.0 to 60.0;

[0058] The first lens 4 can be a lens with a focal length f1 satisfying 10mm≤f1≤25mm, a refractive index of 1.45~1.90, an Abbe number of 35.0~85.0, a radius of curvature R11 of the first surface 401 satisfying R11≥100mm or R11≤-100mm, and a radius of curvature R12 of the second surface 402 satisfying 40mm≤R12≤80mm; wherein, the first surface 401 of the first lens 4 is the surface closer to the first triangular prism 2; and the second surface 402 of the first lens 4 is the surface away from the first triangular prism 2.

[0059] Furthermore, the gap between the first surface 401 of the first lens 4 and the second surface 202 of the first prism 2 is 0.01mm to 1.0mm.

[0060] As shown above, a second lens 6 can be further disposed between the image source 1 and the first surface 201 of the first prism 2. Specifically, the second lens 6 can have a focal length f2 satisfying f2≥50mm or f2≤-50mm, a refractive index of 1.45~1.90, an Abbe number of 35.0~85.0, and a radius of curvature R21 of the first surface 601 and a radius of curvature R22 of the second surface 602 satisfying |R21-R22|>50mm; wherein, the first surface 601 of the second lens 6 is the surface facing away from the first prism 2; the second surface 602 of the second lens 6 is the surface close to the first prism 2; and the gap between the first surface 601 of the second lens 6 and the first surface 201 of the first prism 2 is 0.05mm~3.0mm.

[0061] In the embodiment where a second lens 6 is disposed between the image source 1 and the first surface 201 of the first prism 2, the diopter can also be changed by moving the distance between the image source 1 and the first prism 2; the diopter can also be changed by moving the second lens 6 relative to the first prism 2 or by moving the image source 1 and the second lens 6 simultaneously, and this embodiment does not impose any restrictions on this.

[0062] As mentioned earlier, the second lens 6 can also correct aberrations and reduce refractive errors. The addition of the second lens can improve image quality and reduce optical distortion.

[0063] In this embodiment, if the positions of the three optical elements, namely the first prism 2, the second prism 3, and the first lens 6, are kept fixed, and the position of the second lens 6 is not set or is kept fixed, the diopter of the entire optical display device can only be changed by moving the image source 1 to adjust the adaptive diopter. However, if the movable second lens 6 is set, the adaptive diopter can be adjusted by moving the smaller image source 1 and / or the second lens 6.

[0064] Of course, moving only one of the image source 1 and the second lens 6, or moving both of them, will produce different effects. Moving only the image source 1 or the second lens 6 simplifies the driving structure, requiring only one corresponding driving component; however, this results in greater image distortion and FOV reduction, potentially causing image edges to not be displayed clearly and completely.

[0065] Both image source 1 and second lens 6 move, which requires higher relative stability during their movement, as well as higher stability and accuracy of the driving components. The second lens 6 distributes the refraction, and the angle of light transmitted from image source 1 through the second lens 6 remains consistent, which can reduce image distortion and FOV reduction during the movement process and ensure higher imaging quality during refractive power adjustment.

[0066] In the embodiment of this application in which a third lens 7 is provided on one side of the second surface 302 of the second triangular prism 3, the third lens 7 can be a lens with a focal length f3 satisfying f3≥50mm or f3≤-50mm, a refractive index of 1.45~1.90, an Abbe number of 35.0~85.0, a radius of curvature R31 of the first surface 701 satisfying R31≥100mm or R31≤-100mm, and a radius of curvature R32 of the second surface 701 satisfying R32≥100mm or R32≤-100mm; wherein, the first surface 701 of the third lens 7 is the surface close to the second triangular prism 3; and the second surface 702 of the third lens 7 is the surface away from the second triangular prism 3.

[0067] For optical display devices that include a third lens 7, the diopter of the entire optical display device can be changed by moving the distance between the third lens 7 and the second surface 302 of the second prism 3.

[0068] In the embodiments of the above-mentioned moving image source 1 and / or second lens 6, only the diopter adjustment of the projected imaging light of image source 1 can be performed, and the ambient light seen by the human eye has not undergone diopter adjustment.

[0069] For optical display devices equipped with a third lens 7, not only does the projection light from image source 1 enter the human eye through the third lens 7, but ambient light also needs to enter the human eye through the third lens 7. Therefore, by moving the third lens 7, the refractive power of the projection light entering the human eye can be adjusted, as can the refractive power of the ambient light, so that the wearer can see both the ambient image and the projected image formed by the projection light output from image source 1 at the same time, thus achieving better virtual-real fusion and avoiding eye fatigue and discomfort caused by frequent lens adjustment when switching between viewing the projected image and the ambient image.

[0070] As shown in Table 1, Table 1 corresponds to Figure 1 In the illustrated embodiment, each optical element corresponds to a set of parameters.

[0071] Table 1:

[0072]

[0073] Based on the optical display device shown in Table 1, the spread function of each field of view is around 50 μm, the maximum distortion of the projected image is around 14.0%, the MTF of each field of view is greater than 0.1 within 24 lp / mm, the relative illuminance of the entire image plane is greater than 80%, and the illumination is uniform. It can be seen that the optical display device has good imaging quality.

[0074] As shown in Table 2, Table 2 corresponds to Figure 2 In the illustrated embodiment, each optical element corresponds to a set of parameters.

[0075] Table 2:

[0076]

[0077] Based on the optical display device formed in Table 2, the spread function of each geometric point in the field of view is less than 50 μm; the maximum distortion of the projected image is about 9.5%, and the overall distortion is small; the MTF of each field of view of the imaging system is greater than 0.1 within 30 lp / mm; the relative illumination of the entire image plane of the imaging system is greater than 80%, and the illumination is uniform.

[0078] As shown in Table 3:

[0079]

[0080] Based on the optical display device formed in Table 3, the spread function of each geometric point in the field of view is less than 50 μm; the maximum distortion of the projected image is about 14.0%; the MTF of each field of view of the imaging system is greater than 0.1 within 30 lp / mm; the relative illumination of the entire image plane of the imaging system is greater than 80%, and the illumination is uniform.

[0081] In summary, this application utilizes the interaction between the first prism and the first lens to allow the projection light to be repeatedly folded within the first prism, providing a sufficiently long optical path. Furthermore, the projection light only needs to undergo two reflections within the first prism, ensuring a sufficient optical path while avoiding excessive reflections that would lead to an overly large first prism, thus contributing to a lightweight overall display device structure. Additionally, because the first surface of the first prism is closer to the wearer's eye, and the image source outputs projection light to the first surface of the first prism, the image source is located on the side of the first prism closer to the wearer's head, facilitating image source installation and simplifying the installation structure. The optical display device provided in this application has a simple structure and a relatively small overall size, which is conducive to its widespread application.

[0082] This application also provides an AR display device, including the optical display device described in any of the above embodiments.

[0083] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that the elements inherent in a process, method, article, or apparatus that includes a list of elements are included. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, portions of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0084] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An optical display device, characterized in that, include: Image source, first prism, second prism, and first lens; The image source is disposed on one side of the first surface of the first prism, and the first lens is disposed in conjunction with the second surface of the first prism; the first surface of the second prism is disposed in conjunction with the third surface of the first prism; both the first and third surfaces of the first prism are located on the side of the second prism closer to the wearer's eye, and the second surface of the first prism is located on the side of the second prism away from the wearer's eye; a first semi-transparent and semi-reflective film is disposed on the surface of the first lens away from the first prism. The projected light output from the image source enters the first prism through the first surface of the first prism, and then passes through the total internal reflection of the second surface of the first prism, the reflection of the third surface of the first prism, the transmission through the second surface of the first prism to the first lens, and after being reflected by the first semi-transparent and semi-reflective film, it passes through the second and third surfaces of the first prism and the second prism to be transmitted and output to the human eye. The distance between the image source and the first surface of the first prism is relatively adjustable, and the change in relative distance is less than 2.5 mm; The included angle α between the second and third surfaces of the first prism satisfies 15° < α < 35°.

2. The optical display device as described in claim 1, characterized in that, The included angle b between the first and second surfaces of the second triangular prism satisfies 15° < b < 25°; and ab ≤ 10°. The second surface of the second triangular prism is the surface on the side that outputs the projected light.

3. The optical display device as described in claim 1, characterized in that, A polarizing film is provided on the third surface of the first prism; a quarter-wave plate is provided between the first lens and the polarizing film; Alternatively, a second semi-transparent and semi-reflective film may be provided on the third surface of the first prism.

4. The optical display device as described in claim 1, characterized in that, Both the first and second prisms have a refractive index of 1.45 to 1.75 and an Abbe number of 18.0 to 60.

0. The first lens has a focal length f1 satisfying 10mm≤f1≤25mm, a refractive index of 1.45~1.90, an Abbe number of 35.0~85.0, a radius of curvature R11 of the first surface satisfying R11≥100mm or R11≤-100mm, and a radius of curvature R12 of the second surface satisfying 40mm≤R12≤80mm; wherein, the first surface of the first lens is the surface closer to the first prism; and the second surface of the first lens is the surface away from the first prism. The gap between the first surface of the first lens and the second surface of the first prism is 0.01 mm to 1.0 mm.

5. The optical display device according to any one of claims 1 to 4, characterized in that, A second lens is also provided between the image source and the first surface of the first prism.

6. The optical display device as described in claim 5, characterized in that, The second lens is movable relative to the first prism.

7. The optical display device as described in claim 5, characterized in that, The second lens and the image source can move synchronously relative to the first prism.

8. The optical display device as described in claim 5, characterized in that, The second lens has a focal length f2 that satisfies f2≥50mm or f2≤-50mm, a refractive index of 1.45~1.90, an Abbe number of 35.0~85.0, and a radius of curvature R21 of the first surface and a radius of curvature R22 of the second surface that satisfies |R21-R22|>50mm; wherein, the first surface of the second lens is the surface facing away from the first prism body; and the second surface of the second lens is the surface close to the first prism body. The gap between the first surface of the second lens and the first surface of the first prism is 0.05mm to 3.00mm.

9. The optical display device according to any one of claims 1 to 4, characterized in that, A third lens is also provided on one side of the second surface of the second triangular prism; wherein, the second surface of the second triangular prism is the surface from which the projected light is transmitted and output.

10. The optical display device as claimed in claim 9, characterized in that, The third lens has a focal length f3 that satisfies f3≥50mm or f3≤-50mm, a refractive index of 1.45~1.90, an Abbe number of 35.0~85.0, a radius of curvature R31 of the first surface that satisfies R31≥100mm or R31≤-100mm, and a radius of curvature R32 of the second surface that satisfies R32≥100mm or R32≤-100mm; wherein, the first surface of the third lens is the surface closer to the second triangular prism; and the second surface of the third lens is the surface away from the second triangular prism.

11. The optical display device as claimed in claim 9, characterized in that, The third lens is movable relative to the second surface of the second prism.

12. An AR display device, characterized in that, Includes the optical display device as described in any one of claims 1 to 11.

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