Bifocal plane visual optical system

Abstract

According to the double-focal-plane visual optical system provided by the invention, the optical path is applied to double focal planes, two display screens and a display are independently powered, switching among different display focal planes can be realized by selecting single work or simultaneous work according to requirements, and under the condition of simultaneous work, a group of focal planes display main information graphs; the other group of focal planes display an out-of-focus stimulation image playing an auxiliary role, and the content of the out-of-focus stimulation image can be selected according to requirements; therefore, according to the double-focal-plane augmented reality near-to-eye display optical system provided by the invention, the focal depth can be regularly changed, so that the functions of the eyes can be exercised, the potential of the eyes can be fully aroused, asthenopia can be relieved, the adjustment speed can be improved, the adjustment amplitude can be increased, and adjustment lagging, insufficient adjustment functions and the like can be effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical display, and particularly relates to a bifocal visual optical system. Background Art

[0002] In recent years, with the development of virtual reality (VR) and augmented reality (AR) technologies, near-eye display devices for VR or AR have shown great development potential.

[0003] A near-eye display device can magnify the image of an image source and present it in front of a user's eyes. For a large number of myopic or hyperopic users, a near-eye display device with a virtual image located at a fixed position cannot meet the needs of users. At the same time, for certain specific application scenarios, such as in visual training and other requirements, users need to adjust the distance of the virtual image according to the purpose to achieve the adjustment of visual acuity.

[0004] In addition, children and adolescents are in the growth and development period and the peak period of eye use. Helping them establish good eye use habits, conducting scientific physical exercises and training on the eyes and visual system, and enhancing the eye accommodation ability are helpful for preventing and controlling myopia, repairing amblyopia, improving the level of naked-eye vision health, and reducing the dependence on vision correction means such as glasses and surgery. Therefore, near-eye display devices with a visual acuity adjustment function are increasingly needed by the vast user groups. Summary of the Invention

[0005] To solve the above problems, the present invention provides a bifocal visual optical system. The human eye can switch between two focal planes, so that the human eye can be exercised for vision prevention and control. At the same time, it also has a visual acuity adjustment function to meet the usage requirements of different visual acuity populations and is applicable to augmented reality or virtual reality display scenarios.

[0006] A bifocal visual optical system includes a planar beam splitter, a curved mirror, and coaxial first lens, a transparent display screen, a first lens group, a second lens group, and a display; wherein, the transparent display screen serves as the first focal plane, and the display serves as the second focal plane;

[0007] The light emitted by the transparent display screen sequentially passes through the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter and then enters the human eye, so that an image of the first focal plane is obtained at the human eye;

[0008] The light emitted by the display sequentially passes through the second lens group, the first lens group, the transparent display screen, the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter and then enters the human eye, so that an image of the second focal plane is obtained at the human eye.

[0009] Further, the transparent display screen and the monitor work independently of each other, so the transparent display screen and the monitor can work simultaneously or individually.

[0010] Further, when the transparent display screen and the monitor work simultaneously, one focal plane displays information graphics and the other focal plane displays a defocused stimulation image.

[0011] Further, when an image of the first focal plane is obtained at the human eye, the display optical path includes a planar beam splitter Bs, a curved mirror Refl, a first lens L1, and a transparent display screen IMA1 arranged in the direction of the optical axis from the human eye to the first focal plane.

[0012] Further, when an image of the second focal plane is obtained at the human eye, the display optical path includes a planar beam splitter Bs, a curved mirror Refl, a first lens L1, a transparent display screen IMA1, a first lens group, a second lens group, and a monitor IMA2 arranged in the direction of the optical axis from the human eye to the second focal plane and from the human eye to the first image source.

[0013] Further, the tilt range of the planar beam splitter is 25° to 45°.

[0014] Further, the curved mirror is a spherical surface, an aspherical surface, or a free-form surface.

[0015] Further, by moving the position of the transparent display screen and / or the monitor forward and backward, the movement of the first focal plane and / or the second focal plane is realized.

[0016] Further, the first lens group includes coaxially arranged lenses L2 and L3, and the second lens group includes coaxially arranged lenses L4, L5, L6, and L7.

[0017] Further, the first lens group includes coaxially arranged lenses L2, L3, and L4, and the second lens group includes coaxially arranged lenses L5, L6, L7, and L8.

[0018] Advantageous effects:

[0019] The present invention provides a binocular vision optical system. In the application of the binocular focal planes, the two display screens and the monitor are independently powered, and can be selectively operated individually or simultaneously according to requirements to achieve switching between different display focal planes. When operating simultaneously, one set of focal planes displays main information graphics; the other set of focal planes displays defocused stimulation images that play an auxiliary role, and the content of the defocused stimulation images can be selected according to requirements. Therefore, the binocular focal plane augmented reality near-eye display optical system provided by the present invention can exercise the eye function by regularly changing the depth of focus, fully mobilize the potential of the eyes, relieve visual fatigue, improve the accommodation speed, increase the accommodation amplitude, and effectively improve accommodation lag, insufficient accommodation function, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the optical path diagram of the first focal plane for Example 1 to show the optical path;

[0021] Figure 2 It is the optical path diagram of the second focal plane for Example 1 to show the optical path;

[0022] Figure 3 It is a schematic diagram of a high-brightness display with a lens array for Example 1;

[0023] Figure 4 It is the overall optical path diagram for Example 1;

[0024] Figure 5 It is the layout diagram of optical elements for the overall Example 1;

[0025] Figure 6 It is the optical path diagram of the first focal plane for Example 2 to show the optical path;

[0026] Figure 7 It is the optical path diagram of the second focal plane for Example 2 to show the optical path;

[0027] Figure 8 It is a schematic diagram of a high-brightness display with a lens array for Example 2;

[0028] Figure 9 It is the overall optical path diagram for Example 2;

[0029] Figure 10 It is the layout diagram of optical elements for the overall Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0030] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application.

[0031] A dual-focus visual optical system includes a planar beam splitter, a curved mirror, and coaxial first lens, a transparent display screen, a first lens group, a second lens group, and a display; wherein, the transparent display screen serves as the first focal plane, and the display serves as the second focal plane; the transparent display screen and the display work independently, so the transparent display screen and the display can work simultaneously or individually, and provide image sources to the first display optical path and the second display optical path respectively; when the transparent display screen and the display work simultaneously, one of the focal planes displays information graphics, and the other focal plane displays a defocused stimulating image. The positions of the first focal plane and the second focal plane are different.

[0032] The light emitted by the transparent display screen sequentially passes through the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter and then enters the human eye, so that an image of the first focal plane is obtained at the human eye;

[0033] The light emitted by the display passes through the second lens group, the first lens group, the transparent display screen, the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter in sequence and then enters the human eye, so that an image of the second focal plane is obtained at the human eye. Among them, the high-brightness display adopts a scheme of a liquid crystal panel, a microlens array and lamp beads to improve the image brightness, and contracts the divergence angle of the screen through the microlens array to reduce stray light interference.

[0034] When an image of the first focal plane is obtained at the human eye, the display optical path includes a planar beam splitter Bs, a curved mirror Refl, a first lens L1, and a transparent display screen IMA1 arranged in sequence along the optical axis direction from the human eye to the first focal plane; the first lens is a positive lens, and antireflection films need to be coated on both surfaces of the first lens surface; the light emitted by the transparent display screen passes through the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter in sequence and finally enters the human eye.

[0035] When an image of the second focal plane is obtained at the human eye, the display optical path includes a planar beam splitter Bs, a curved mirror Refl, a first lens L1, a transparent display screen IMA1, a first lens group, a second lens group, and a display IMA2 arranged in sequence along the optical axis direction from the human eye to the second focal plane and from the human eye to the first image source; the first focal plane and the second focal plane of the display optical path share the planar beam splitter, the curved mirror, and the first lens; the light emitted by the second focal plane passes through the second lens group, the first lens group, the transparent display screen, the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter in sequence and finally enters the human eye; in the optical path corresponding to the second focal plane, there is an intermediate image plane, and the intermediate image plane is located between the second lens group and the first lens.

[0036] Preferably, the diopter corresponding to one focal plane is -6D to -0D, and the diopter corresponding to the other focal plane is +0D to +5D.

[0037] Preferably, the positions of the first focal plane and / or the second focal plane are adjustable; by moving the positions of the transparent display screen and / or the high-brightness liquid crystal screen forward and backward, the movement of the two focal planes is realized.

[0038] Preferably, the exit pupil distance range of the display optical path is 200 mm to 300 mm.

[0039] Preferably, the tilt range of the planar beam splitter of the display optical path is 25° to 45°.

[0040] Preferably, the curved mirror of the display optical path can be a spherical surface, an aspherical surface, and a free-form surface.

[0041] The following is combined with Figures 1 to 5A first embodiment of a dual - focal - plane visual optical system and a near - eye display device provided by the present invention is given. The display optical path includes, arranged along the visual axis direction from the human eye to the first image source, a planar beam splitter Bs, a curved mirror Refl, a first lens L1, and a transparent display screen IMA1, corresponding to the first focal plane. The display optical path includes, arranged from the human eye to the second image source, a planar beam splitter Bs, a curved mirror Refl, a first lens L1, a transparent display screen IMA1, a first lens group (including L2, L3), a second lens group (including L4, L5, L6, L7), and a high - brightness display IMA2 (including a liquid crystal panel, a lens array Array1, a lens array Array2, and lamp beads), corresponding to the second focal plane. Among them, in the optical path corresponding to the second focal plane, there is an intermediate image plane, and the intermediate image plane is located between the second lens group and the first lens.

[0042] It should be noted that taking the aperture surface serial number as 1 and so on, the optical design data of the first - focal - plane optical path of the above - mentioned embodiment is shown in Table 1 below; the optical design data of the second - focal - plane optical path of the above - mentioned embodiment is shown in Table 2 below. Among them, for the corresponding relationship of each serial number in Table 1, 1 is the STP surface, 2 is the transmissive bs semi - transparent and semi - reflective surface, 3 is the curved mirror surface, 4 is the bs semi - transparent and semi - reflective reflection surface, 5 - 7 are coordinate positioning surfaces. The coordinate positioning surfaces are used to provide a positioning standard when correcting the eccentricity and tilt existing on the surfaces of each component, and have no actual physical meaning. 8 is the front surface of lens L1. Similarly, the subsequent serial numbers are sorted in sequence according to the optical table order passed by the light ray with the light propagation direction as the guide.

[0043] Table 1 (unit: mm)

[0044]

[0045] Table 2 (unit: mm)

[0046]

[0047]

[0048] Next, in combination with Figures 6 to 10 A second embodiment of a dual - focal - plane visual optical system and a near - eye display device provided by the present invention is given.

[0049] The display optical path includes a planar beam splitter Bs, a curved mirror Refl, a first lens L1, and a transparent display screen IMA1 arranged along the visual axis direction from the human eye to the first image source. The display optical path includes a planar beam splitter Bs, a curved mirror Refl, a first lens L1, a transparent display screen IMA1, a first lens group (including L2, L3, L4), a second lens group (including L5, L6, L7, L8), and a high-brightness display IMA2 (including a liquid crystal panel, a lens array, a Fresnel diffuser, and lamp beads) arranged from the human eye to the second image source. Taking the aperture surface number as 1 and so on, the optical design data of the first focal plane optical path of the embodiment are shown in Table 3 below; the optical design data of the second focal plane optical path of the embodiment are shown in Table 4 below.

[0050] Table 3 (unit: mm)

[0051]

[0052]

[0053] Table 4 (unit: mm)

[0054]

[0055] In summary, the present invention provides a dual-focus binocular optical system and a near-eye display device built based on the dual-focus binocular optical system. By combining the eyepiece optical system and the Birdbath-type optical system to achieve dual-focus display, the human eye can switch between two focal planes, thereby exercising the human eye and preventing myopia. Moreover, the above-mentioned dual-focus binocular optical system can also have a diopter adjustment function to meet the usage requirements of different diopter groups of people and is applicable to augmented reality or virtual reality display scenarios.

[0056] Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can surely make various corresponding changes and deformations according to the present invention. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A bifocal visual optical system, characterized in that, It includes a planar beam splitter, a curved mirror, and coaxial first lens, a transparent display screen, a first lens group, a second lens group, and a display; wherein, the transparent display screen serves as the first focal plane, and the display serves as the second focal plane; The light emitted from the transparent display screen sequentially passes through the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter and then enters the human eye, so that an image of the first focal plane is obtained at the human eye; The light emitted from the display sequentially passes through the second lens group, the first lens group, the transparent display screen, the first lens, the planar beam splitter, the curved mirror, and the planar beam splitter and then enters the human eye, so that an image of the second focal plane is obtained at the human eye.

2. The dual-focus binocular vision optical system according to claim 1, characterized in that, The transparent display screen and the display work independently of each other, so the transparent display screen and the display can work simultaneously or individually.

3. The dual-focus binocular vision optical system according to claim 2, characterized in that, When the transparent display screen and the display work simultaneously, one of the focal planes displays an information graphic, and the other focal plane displays a defocused stimulation image.

4. A dual-focus binocular visual optical system according to claim 1, wherein, When an image of the first focal plane is obtained at the human eye, the display optical path includes, along the optical axis direction, the planar beam splitter Bs, the curved mirror Refl, the first lens L1, and the transparent display screen IMA1 arranged and distributed from the human eye to the first focal plane.

5. A dual-focus binocular vision optical system according to claim 1, characterized in that, When an image of the second focal plane is obtained at the human eye, the display optical path includes, along the optical axis direction, the planar beam splitter Bs, the curved mirror Refl, the first lens L1, the transparent display screen IMA1, the first lens group, the second lens group, and the display IMA2 arranged and distributed from the human eye to the second focal plane and arranged from the human eye to the first image source.

6. The dual-focus binocular vision optical system according to claim 1, wherein, The tilt range of the planar beam splitter is 25° to 45°.

7. The dual-focus binocular vision optical system according to claim 1, characterized in that, The curved mirror is a spherical surface, an aspherical surface, or a free-form surface.

8. A dual-focus binocular vision optical system according to claim 1, characterized in that, By moving the positions of the transparent display screen and / or the display forward and backward, the movement of the first focal plane and / or the second focal plane is realized.

9. The dual-focus binocular vision optical system according to claim 1, wherein The first lens group includes coaxial lenses L2 and L3, and the second lens group includes coaxial lenses L4, L5, L6, and L7.

10. A dual-focus binocular vision optical system according to claim 1, characterized in that, The first lens group includes coaxial lenses L2, L3, and L4, and the second lens group includes coaxial lenses L5, L6, L7, and L8.

Images