Diopter-adjustable optical system and near-to-eye display equipment

Abstract

The utility model discloses a diopter-adjustable optical system and a near-to-eye display device, the diopter-adjustable optical system comprises a display screen, and the diopter-adjustable optical system sequentially comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and a sixth lens group from the human eye side to the display screen side from the human eye side to the display screen side; a beam splitter prism; a second lens group; the distance between the display screen and the second lens group is adjustable; the diopter-adjustable optical system satisfies the following conditional expressions: 0.5 gt; d1 / TTLgt; 0.28, 0.28; wherein D1 represents the total optical length of the first lens group, TTL represents the sum of the total optical lengths of the first lens group, the beam splitter prism and the second lens group, and the diopter-adjustable optical system has the advantages of being large in field angle, adjustable in diopter and high in luminous efficiency and can bring excellent sensory experience to a user; the near-to-eye display device realizes a dual-wavelength dual-optical-path optical structure through light path reflection of the beam splitter prism, and can realize an eye movement tracking function by matching with an infrared imaging system.

Description

Technical Field

[0001] The utility model relates to the technical field of optical systems with adjustable diopter, in particular to an optical system with adjustable diopter and a near-eye display device. Background Art

[0002] In recent years, the application of augmented or virtual reality (AR / VR) devices has grown rapidly in various industries such as gaming, military, education, transportation, and medicine.

[0003] Near-eye display devices, as a type of display system that needs to be viewed as close to the eyes as possible, can provide immersive visual input. To provide users with an excellent sensory experience, near-eye display devices need to have a large field of view, a long interocular distance, a large eye movement range, and high-quality imaging. At the same time, to meet the needs of users with different degrees of myopia, they also need to have adjustable diopter. At the same time, to improve the quality of the display image and reduce device power consumption, some near-eye display devices use eye tracking technology, which can quickly and accurately detect the user's gaze direction within the device, thereby rendering at the gaze point and improving the user's sensory experience.

[0004] The optical systems currently installed in near-eye display devices still have shortcomings such as small field of view, poor diopter adjustment, low light efficiency, and poor eye tracking interaction, which cannot meet the diverse market needs well. Utility Model Content

[0005] The utility model provides an optical module with adjustable diopter and a near-eye display device to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An optical system with adjustable diopter includes a display screen. The optical system with adjustable diopter further includes, in order from the human eye side to the display screen side:

[0008] a first lens group, the first lens group comprising at least four lenses, the first lens group comprising, from the human eye side to the display screen side, a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, and a fourth lens having negative optical power;

[0009] Beam splitter prism; the beam splitter prism includes a light incident surface, a light emitting surface, a reflective surface and a light transmitting surface

[0010] a second lens group, the second lens group comprising at least three lenses with negative optical power and four lenses with positive optical power;

[0011] The light signal emitted by the display screen is sequentially transmitted through the second lens group, the dichroic prism and the first lens group to the human eye, and the distance between the display screen and the second lens group is adjustable;

[0012] The optical system with adjustable diopter also satisfies the following conditional formula:

[0013] 0.5>D1 / TTL>0.28;

[0014] Wherein, D1 represents the total optical length of the first lens group, and TTL represents the sum of the total optical lengths of the first lens group, the beam splitter prism, and the second lens group.

[0015] In one embodiment, the image information emitted by the display screen passes through the second lens group and the dichroic prism, is converted into a relay image in the first lens group, and then is transmitted to the human eye through the first lens group.

[0016] In one embodiment, the first lens group includes 4-7 lenses.

[0017] In one embodiment, the second lens group includes 9-10 lenses.

[0018] In one embodiment, the adjustable distance variation D of the display screen relative to the second lens group is: 11 mm <D<15mm。

[0019] In one embodiment, the total optical length of the first lens group is in the range of 110 mm>D1>80 mm.

[0020] In one embodiment, the optical system with adjustable diopter has an exit pupil distance ER ≥ 10 mm and an exit pupil range EB ≥ 10 mm.

[0021] In one embodiment, the focal length of the optical system with adjustable diopter is -13mm>f>-17mm.

[0022] The present invention also provides a near-eye display device, comprising an optical system with adjustable diopter as described above, and an eye tracking system, wherein the eye tracking system comprises an infrared imaging system, and the infrared imaging system is arranged on one side of the light-transmitting surface of the dioptre prism; the dioptre prism transmits the pupil information of the human eye received in the first lens group so that it is incident on the infrared imaging system.

[0023] In one embodiment, the infrared imaging system includes 3-4 lenses.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The utility model provides an optical system with adjustable diopter and a near-eye display device. The optical system with adjustable diopter includes a display screen, and the optical system with adjustable diopter further includes, from the human eye side to the display screen side, in sequence: a first lens group; a diopter prism; a second lens group; the display screen is adjustable relative to the second lens group; the optical system with adjustable diopter satisfies the following conditional formula: 0.5>D1 / TTL>0.28; wherein D1 represents the total optical length of the first lens group, and TTL represents the sum of the total optical lengths of the first lens group, the diopter prism, and the second lens group. The optical system with adjustable diopter has the advantages of a large field of view angle, adjustable diopter, and high light efficiency, and can bring excellent sensory experience to users; the near-eye display device realizes a dual-wavelength dual-light path optical structure through light path reflection of the diopter prism, and can realize eye tracking function when combined with an infrared imaging system.

[0026] The present invention has other features and advantages, which will be apparent from the accompanying drawings and subsequent detailed descriptions incorporated herein, or will be described in detail in the accompanying drawings and subsequent detailed descriptions incorporated herein, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of an optical system with adjustable diopter provided by an embodiment of the utility model.

[0029] Figure 2 This is a structural schematic diagram of a near-eye display device provided in the third embodiment of the present utility model. DETAILED DESCRIPTION

[0030] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0031] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0032] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0033] In this application, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, priority or sequence relationship between these entities or operations.

[0034] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0035] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; and expressions such as "above," "below," "within," and "at least" are understood to include the number itself. Those skilled in the art to which this application relates can understand the specific meanings of the above terms in the examples of this application based on specific circumstances.

[0036] With the development of display technology, near-eye display technology has received widespread attention and has gradually been widely used in various fields such as gaming, social networking, education, and medical care. In order to make near-eye display devices lighter and thinner, most manufacturers choose to use a folded optical path structure. This structure can greatly reduce the thickness of the optical structure. However, due to the multiple folded light transmission losses of the folded optical path structure, the light has low light efficiency. In addition, there are shortcomings such as a small field of view, poor diopter adjustment, low light efficiency, and poor eye tracking interaction, which affect the user's viewing experience. Therefore, there is an urgent need to propose an optical system with high light efficiency and high imaging quality to meet market demand.

[0037] In order to solve the problems existing in the prior art, the present invention proposes an optical system with adjustable diopter and a near-eye display device. The solution of the present invention is introduced below with reference to the accompanying drawings.

[0038] like Figure 1 FIG. 1 is a schematic diagram of a structure of an optical system with adjustable diopter; the optical system with adjustable diopter includes a display screen 1, and the optical system with adjustable diopter further includes, from the side of the human eye 5 to the side of the display screen 1:

[0039] a first lens group 4, comprising at least four lenses, which include, from the side of the human eye 5 to the side of the display screen 1, a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, and a fourth lens having negative optical power;

[0040] Beam splitter prism 3; the beam splitter prism includes a light incident surface 31, a light emitting surface 32, a reflective surface 33 and a light transmitting surface 34;

[0041] A second lens group 2, wherein the second lens group 2 includes at least three lenses with negative optical power and four lenses with positive optical power;

[0042] The light signal emitted by the display screen 1 is sequentially transmitted through the second lens group 2, the beam splitter prism 3 and the first lens group 4 to the human eye 5, and the distance between the display screen 1 and the second lens group 2 is adjustable;

[0043] The optical system with adjustable diopter also satisfies the following conditional formula:

[0044] 0.5>D1 / TTL>0.28;

[0045] Wherein, D1 represents the total optical length of the first lens group 4, and TTL represents the sum of the total optical lengths of the first lens group 4, the beam splitter prism 3, and the second lens group 2.

[0046] In a specific implementation process, the first lens group 4 can be 4 lenses, and the first lens group 4 includes, from the side of the human eye 5 to the side of the display screen 1, in sequence: a first lens with positive optical focal length, a second lens with negative optical focal length, a third lens with positive optical focal length, and a fourth lens with negative optical focal length; it can also be more than 4 lenses, with one or more lenses added to any side of the first lens, the second lens, the third lens, and the fourth lens, wherein the optical focal length of the first lens group 4 is positive.

[0047] In addition, the second lens group 2 can be 7 lenses, including 3 lenses with negative optical power and 4 lenses with positive optical power, wherein the 3 lenses with negative optical power and the 4 lenses with positive optical power can be arranged in any order; the second lens group 2 can also have more than 7 lenses, wherein in addition to the 3 lenses with negative optical power and the 4 lenses with positive optical power that can be arranged in any order, one or more lenses can be added to form any combination with the 3 lenses with negative optical power and the 4 lenses with positive optical power, wherein the optical power of the second lens group 2 is positive.

[0048] In a specific implementation, the display screen 1 is used to emit a light signal including image information. The display screen 1 may be one of Micro LED, OLED, LCD, LCOS, and M-OLED, and may provide high-definition image information for an optical system with adjustable diopter.

[0049] In a specific embodiment, the beam splitter prism 3 includes a light incident surface 31, a light emitting surface 32, a reflective surface 33, and a light transmissive surface 34. The light transmissive surface 34 is perpendicular to the light emitting surface 32 and the light incident surface 31, and the reflective surface 33 is angled relative to the light emitting surface 32 and the light incident surface 31. The angle is selected from a range of 20° to 70°, with 45° being optimal. For example, the beam splitter prism 3 can be composed of two isosceles right-angle prisms or two non-isosceles prisms combined to form a rectangular shape, without limitation.

[0050] In a specific implementation process, the light transmission path of the refractive adjustable optical system can be that the light signal emitted by the display screen 1 passes through the second lens group 2, is redirected to the first lens group 4 through the dichroic prism 3, and is then transmitted to the human eye 5 through the first lens group 4; or the light signal emitted by the display screen 1 passes through the second lens group 2, is transmitted to the first lens group 4 through the dichroic prism 3, and is then transmitted to the human eye 5 through the first lens group 4.

[0051] The present invention provides an optical system with adjustable diopter, and light transmission is as follows: the image on the display screen 1 of the near-eye display device is transmitted and magnified through the second lens group 2, the diopter prism 3, and the first lens group 4 of the present invention and then transmitted to the human eye 5. At this time, what the human eye 5 receives on the side of the optical system with adjustable diopter is the magnified virtual image of the display screen 1. In addition, in the optical system with adjustable diopter, the light does not need to be folded back multiple times within the system and transmitted along the same straight line. It has high light efficiency and high resolution. When used on a near-eye display device, it effectively improves the user's sense of immersion and can bring a better experience to the user. In addition, the optical system achieves adjustable diopter by adjusting the distance between the display screen 1 and the second lens group 2. In addition, it is suitable for people with normal vision, as well as people with myopia and hyperopia.

[0052] In an exemplary embodiment, the image information emitted by the display screen 1 passes through the second lens group 2 and the beam splitter prism 3, and is converted into a relay image in the first lens group 4 and then transmitted to the human eye through the first lens group 4. In the specific implementation process, the existence of the relay image is beneficial to increasing the total optical length and providing a larger installation space for other functional devices. At the same time, the existence of the relay image enables the effective limitation of the aperture of the module and the size of the final target surface even under a longer total length.

[0053] In an exemplary embodiment, the first lens group 4 includes 4 to 7 lenses. In the specific implementation process, the first lens group 4 can be 4, 5, 6 or 7 lenses.

[0054] In an exemplary embodiment, the second lens group 2 includes 9 to 10 lenses. In the specific implementation process, the second lens group 2 can be 9 or 10 lenses. In the specific combination method, in addition to the combination of 3 lenses with negative optical power and 4 lenses with positive optical power arranged in any order, 2 or 3 lenses can also be added and combined with the above 7 lenses arbitrarily.

[0055] In an exemplary embodiment, the adjustable spacing variation D range of the display screen 1 relative to the second lens group 2 is: 11mm < D < 15mm. In this embodiment, by limiting the adjustable spacing variation D range of the display screen 1 relative to the second lens group 2, it helps the adjustable refractive optical system to achieve a large variation in diopter from -8D to +5D, covering more different myopic populations and improving the user experience.

[0056] In an exemplary embodiment, the total optical length range of the first lens group 4 is 110mm > D1 > 80mm. In this embodiment, by limiting the total optical length of the first lens group 4 in the optical system, while providing a larger installation space for other functional devices, the total optical length is limited to optimize the product size.

[0057] In an exemplary embodiment, the exit pupil distance ER of the diopter-adjustable optical system is ≥10mm, and the exit pupil range EB is ≥10mm. In this embodiment, by restricting the exit pupil distance and the exit pupil range, the clarity of the user's observed image and the comfort of the eyes are improved.

[0058] In an exemplary embodiment, the focal length of the diopter-adjustable optical system is -13mm > f > -17mm.

[0059] The following uses Examples 1 to 2 to illustrate the optical system and optical performance provided by the embodiments of the present application.

[0060] Example 1:

[0061]

[0062] In this embodiment, the first lens group of the optical system consists of 6 lenses, and the optical focal power from the human eye side is: positive optical power, positive optical power, positive optical power, negative optical power, positive optical power, negative optical power; the second lens group consists of 9 lenses, and the optical focal power from the human eye side is: negative optical power, positive optical power, positive optical power, positive optical power, negative optical power, positive optical power, positive optical power, negative optical power, negative optical power. In this embodiment, the light efficiency is 60% and the field of view angle is 100°. The optical system has the advantages of a large field of view angle, adjustable diopter, and high light efficiency, which can bring excellent sensory experience to users.

[0063] Example 2:

[0064]

[0065] In this embodiment, the first lens group of the optical system consists of 6 lenses, and the optical focal power from the human eye side is: positive optical power, positive optical power, positive optical power, negative optical power, positive optical power, negative optical power; the second lens group consists of 9 lenses, and the optical focal power from the human eye side is: negative optical power, positive optical power, positive optical power, positive optical power, negative optical power, positive optical power, positive optical power, negative optical power, negative optical power. In this embodiment, the light efficiency is 60% and the field of view angle is 90°. The optical system has the advantages of a large field of view angle, adjustable diopter, and high light efficiency, which can bring excellent sensory experience to users.

[0066] According to another embodiment of the present application, a near-eye display device is provided, such as Figure 2 FIG. 1 is a schematic diagram of the structure of a near-eye display device provided in accordance with the third embodiment of the present invention. The near-eye display device includes an optical system with adjustable diopter and an eye tracking system 6 according to any of the above embodiments. The eye tracking system 6 includes an infrared imaging system 61 and an infrared light source (not labeled in the figure). The infrared imaging system 61 is disposed on the side of the light-transmitting surface 34 of the beam splitter prism 3. Specifically, the light signal transmits the pupil information of the human eye received in the first lens group 4 through the light-transmitting surface 34 of the beam splitter prism 3, so that the light signal is incident on the infrared imaging system 61. When used in conjunction with the infrared light source, the eye tracking function of the user's eyes is realized. Furthermore, the dual-wavelength dual-light path optical structure can effectively reduce the thickness of the entire near-eye display device in the direction perpendicular to the optical axis, thereby meeting the demand for thin and light development of near-eye display devices, improving the quality of the displayed image, and reducing the power consumption of the device.

[0067] In summary, in the near-eye display device, the light transmission of the optical system with adjustable diopter is divided into two directions: one implementation method is as follows: Figure 2As shown, light travels from the display screen 1 to the eye 5 (the optical path is shown as solid line A1 in the figure). Image information emitted from the display screen 1 passes through the second lens group 2, is redirected by the beam splitter prism 3, enters the first lens group 4, and then enters the eye 5 to form an image. The user can observe a high-definition, magnified virtual image, providing a highly realistic sensory experience. Meanwhile, light emitted from the eye 5 passes through the first lens group 4 of the adjustable-diopter optical system, is transmitted through the beam splitter prism 3 (the optical path is shown as dashed line A2 in the figure), and enters the infrared imaging system 61. Another implementation method is as follows: light travels from the display screen 1 to the eye 5. Image information emitted from the display screen 1 passes through the second lens group 2, is transmitted through the beam splitter prism 3, enters the first lens group 4, and then enters the eye 5 to form an image. The user can observe a high-definition, magnified virtual image, providing a highly realistic sensory experience. Meanwhile, light emitted from the eye 5 passes through the first lens group 4 of the adjustable-diopter optical system, is redirected by the beam splitter prism 3, and then enters the infrared imaging system 61. The first lens group 4 in the adjustable refractive optical system is used in conjunction with the dichroic prism 3 and the infrared imaging system 61, which can transmit the position information of the human eye pupil to the eye tracking system, and can track the position information of the human eye pupil in real time, enhance the interactivity with the near-eye display device, improve the quality of the display image at the human eye's gaze point, and effectively reduce the power consumption of the device.

[0068] In an exemplary embodiment, the infrared imaging system 61 includes 3-4 lenses. In a specific implementation, the infrared imaging system 61 may include 3 or 4 lenses.

[0069] The near-eye display device provided in this embodiment includes an optical system with adjustable refractive power. Since the optical system with adjustable refractive power has the advantages of a large field of view, high light efficiency, high resolution, and adjustable refractive power, the near-eye display device with this optical system also has the advantages of a large field of view, high light efficiency, high resolution, and adjustable refractive power, thereby improving the user experience of users with different degrees of myopia or hyperopia. Moreover, the optical system uses a dichroic prism in combination with an infrared imaging system to implement an eye tracking solution, which can improve the quality of the display image at the point of gaze of the human eye and effectively reduce the power consumption of the device.

[0070] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. An optical system with adjustable diopter, characterized in that: Including a display screen, the optical system with adjustable diopter further includes, from the human eye side to the display screen side: a first lens group, the first lens group comprising at least four lenses, the first lens group comprising, from the human eye side to the display screen side, a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, and a fourth lens having negative optical power; Beam splitter prism; the beam splitter prism includes a light incident surface, a light emitting surface, a reflective surface and a light transmitting surface a second lens group, the second lens group comprising at least three lenses with negative optical power and four lenses with positive optical power; wherein the light signal emitted by the display screen is transmitted to the human eye through the second lens group, the beam splitter prism, and the first lens group in sequence, and the distance between the display screen and the second lens group is adjustable; The optical system with adjustable diopter also satisfies the following conditional formula: 0.5>D1 / TTL>0.28; Wherein, D1 represents the total optical length of the first lens group, and TTL represents the sum of the total optical lengths of the first lens group, the beam splitter prism, and the second lens group.

2. The optical system with adjustable diopter according to claim 1, wherein: The image information sent by the display screen passes through the second lens group and the dichroic prism, is converted into a relay image in the first lens group, and then is transmitted to the human eye through the first lens group.

3. The optical system with adjustable diopter according to claim 1, wherein: The first lens group includes 4-7 lenses.

4. The optical system with adjustable diopter according to claim 1, wherein: The second lens group includes 9-10 lenses.

5. The optical system with adjustable diopter according to claim 1, wherein: The adjustable distance variation D of the display screen relative to the second lens group is: 11mm <D<15mm。 6. The optical system with adjustable diopter according to claim 2, wherein: The total optical length of the first lens group is in the range of 110 mm>D1>80 mm.

7. The optical system with adjustable diopter according to claim 6, wherein: The optical system with adjustable diopter has an exit pupil distance ER of ≥10 mm and an exit pupil range EB of ≥10 mm.

8. The optical system with adjustable diopter according to claim 7, wherein: The focal length of the optical system with adjustable diopter is -13mm>f>-17mm.

9. A near-eye display device, characterized in that: include: The optical system with adjustable diopter as claimed in any one of claims 1 to 8, and an eye tracking system, wherein the eye tracking system includes an infrared imaging system, and the infrared imaging system is arranged on one side of the light-transmitting surface of the dioptre prism; the dioptre prism transmits the human eye pupil information received in the first lens group so that it is incident on the infrared imaging system.

10. The near-eye display device according to claim 9, wherein: The infrared imaging system includes 3-4 lenses.

Images