Virtual display system, and display

Abstract

A virtual display system, and a display. The virtual display system comprises: a beam splitter (G1) and a concave mirror (G2) which are sequentially arranged from a human eye side to a virtual image plane side in the direction of an optical axis, wherein a reflecting surface of the beam splitter (G1) faces the concave mirror (G2), and a concave surface of the concave mirror (G2) faces the beam splitter (G1). The system further comprises an image display source (1), wherein the image display source (1) emits a light source in a first direction to the beam splitter (G1). The virtual display system satisfies the following formulas: 20°≤α≤40°; 5°≤β≤22°; and 20°≤γ≤35°. The virtual display system of such a structure provides a long exit-pupil distance, and low distortion, and is also thin. A picture of the image display source (1) passes through the beam splitter (G1), with some of the light being reflected and some being transmitted. The reflected light enters the reflecting surface, i.e., the concave surface, of the concave mirror (G2), is converged, and then enters the beam splitter (G1) again and is transmitted into a human eye, and the human eye can see a corresponding virtual image at a long distance ranging from 1 meter to 10 meters away from a display.

Description

Virtual display system and display Technical Field

[0001] The present invention relates to the field of virtual display technology, and in particular to a virtual display system and a display. Background Art

[0002] Existing computer screens are all direct-light emitting screens like LEDs, OLEDs, and LCDs. Long-term use not only fatigues the human eye but also increases the risk of myopia. A virtual display desktop computer not only offers the functionality of a traditional computer but also protects the eyes, reduces fatigue, and prevents myopia. It also provides a more invasive user experience. However, existing virtual desktop projection systems are mostly Birbird, such as those described in Chinese patent CN 211014804 U for a display system and CN111562677A for a head-up display projection device. This structure features a 45° beam splitting structure, meaning the display screen and beam splitting plane are at 45 degrees. This configuration has the disadvantages of being thick, having a short pupil distance, a small pupil drift, and high distortion at the same magnification. Technical Solutions

[0003] In view of this, an object of the present invention is to provide a virtual display system that can solve at least one of the technical problems mentioned in the background technology.

[0004] According to one aspect of the present invention, a virtual display system is provided, comprising a beam splitter and a concave mirror arranged in sequence along the optical axis from the human eye side to the virtual image plane side, wherein the reflective surface of the beam splitter faces the concave mirror, and the concave surface of the concave mirror faces the beam splitter. The system further comprises: an image display source, which emits light along a first direction toward the beam splitter;

[0005] The system satisfies the following equation:

[0006] 20°≤α≤40°

[0007] 5°≤β≤22°

[0008] 20°≤γ≤35°

[0009] Wherein, α is the angle between the beam splitter and the direction perpendicular to the optical axis; β is the angle between the beam splitter and the direction perpendicular to the optical axis; γ is the angle between the image plane of the image display source and the mirror surface of the beam splitter.

[0010] In the above technical solution, a new structural isotropic design scheme is adopted, which not only increases the pupil distance and reduces distortion, but also reduces thickness. In this embodiment, the display source can be an LCD, OLED, LCOS DLP, or a mobile phone or iPad. In this embodiment, a concave mirror is coated with a reflective film facing the human eye. The operating principle of this system is as follows: the image of the image display source passes through a beam splitter, with part of it reflected and part of it projected. The reflected light enters the reflective surface of the concave mirror, i.e., the concave surface, and after converging, it enters the beam splitter again and is projected into the human eye. The human eye will see the corresponding virtual image at a distance of 1 to 10 meters from the display.

[0011] In some embodiments, the system satisfies the following equation:

[0012] 3.5≤L1 / L2≤6.5

[0013] Wherein, L1 is the distance from the human eye side to the beam splitter in the optical axis direction; L2 is the distance between the beam splitter and the physical axis center of the concave mirror.

[0014] In the above technical solution, the distance from the human eye to the spectroscope is defined as the exit pupil distance.

[0015] In some embodiments, the system satisfies the following equation:

[0016] 1.85≤L1 / L3≤3.75

[0017] Wherein, L1 is the distance from the human eye side to the beam splitter in the optical axis direction; L3 is the distance from the beam splitter to the image plane of the image display source in the optical axis direction.

[0018] In some embodiments, the surface of the concave mirror is a free-form surface, and the free-form surface satisfies the following formula:

[0019]

[0020] Where z is the coordinate point in the direction of the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; N is the number of polynomial coefficients in the series; A i and E i Corresponding to the expansion coefficients of the polynomial terms in the x and y directions.

[0021] In some embodiments, the surface of the concave mirror is a high-order aspheric surface, and the high-order aspheric surface satisfies the following formula:

[0022]

[0023] Where z is the coordinate point along the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; α i(i=1, 2, 3…) is the corresponding aspheric coefficient.

[0024] In some embodiments, the surface of the concave mirror is a high-order aspheric surface, and the high-order aspheric surface satisfies the following formula:

[0025]

[0026] Where z is the coordinate point along the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; β i (i=1, 2, 3…) is the corresponding aspheric coefficient.

[0027] In some embodiments, the system satisfies the following equation:

[0028] 0≤h≤80mm

[0029] Wherein, h is the distance between the physical axis of the concave mirror and the optical axis.

[0030] In some embodiments, the system satisfies the following equation:

[0031] 2m≤L≤8m

[0032] 2.5m≤L1≤5.5m

[0033] Wherein, L is the distance from the human eye side to the virtual image plane side in the optical axis direction; L1 is the distance from the human eye side to the beam splitter in the optical axis direction. Beneficial effects

[0034] In the above technical solution, the above invention solution is adopted, the pupil distance is large, the pupil drift is large, the resolution is high, the system is thin, and the distortion is small

[0035] In some embodiments, the tempered strength of the beam splitter is greater than or equal to 300 MPa.

[0036] In the above technical solution, in order to prevent the spectrometer from breaking due to pressure, the minimum stress value needs to meet 300Mpa.

[0037] According to another aspect of the present invention, a display is provided, characterized by comprising the above-mentioned virtual display system. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] FIG1 is a schematic diagram of an optical path structure of an embodiment of a virtual display system of the present invention;

[0040] FIG2 is a schematic structural diagram of a second embodiment of a virtual display system according to the present invention;

[0041] FIG3 is a structural diagram of a fourth embodiment of a virtual display system according to the present invention. Modes for Carrying Out the Invention

[0042] The present invention will be described in further detail below with reference to the accompanying drawings and examples. It is particularly noted that the following examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Similarly, the following examples are only some embodiments of the present invention and are not intended to be exhaustive. All other embodiments obtained by those of ordinary skill in the art without creative effort are intended to fall within the scope of protection of the present invention.

[0043] The present invention provides a virtual display system and a display, which can solve at least one technical problem mentioned in the background technology.

[0044] Example 1

[0045] Please refer to FIG1 , which shows a virtual display system. The parameters of this embodiment are as follows: a 5.5-inch display source 1 is used, the distance L between the human eye and the virtual image plane is 5 meters, and the projected screen size is 100 inches.

[0046] Results: The size of beam splitter G1 is 2 mm. The distance L1 from the human eye to beam splitter G1 is 500 mm. The distance L2 from beam splitter G1 to concave mirror G2 is 100 mm. The distance L3 from beam splitter G1 to display source 1 is 170 mm. α = 24°, β = 11°, and γ = 25°.

[0047] The surface of the concave mirror is a high-order aspheric surface, which satisfies the following formula:

[0048]

[0049] Where z is the coordinate point along the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; α i (i=1, 2, 3…) is the corresponding aspheric coefficient.

[0050] Aspheric coefficients of concave mirror: R=-600, k=-14, α1=0, α2=-9e-9, α3=1e-13, α4=-1.2e-18, α5=-5e-29.

[0051] Example 2

[0052] The difference between this embodiment and the first embodiment lies in the different parameters, which are as follows: a 5.5-inch display source is used, the distance L from the human eye to the virtual image plane is 5m, and the projected screen size is 100 inches.

[0053] Results: The size of the beam splitter G1 is 2 mm, the distance L1 from the human eye to the beam splitter G1 is 500 mm, the distance L2 from the beam splitter G1 to the concave mirror G2 is 90 mm, the distance L3 from the beam splitter G1 to the display source 1 is 245 mm, α=27°, β=9°, γ=26°

[0054] The surface of the concave mirror is a free-form surface, which satisfies the following formula:

[0055]

[0056] Where z is the coordinate point along the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; N is the number of polynomial coefficients in the series; A i and E i Corresponding to the expansion coefficients of the polynomial terms in the x and y directions.

[0057] Aspheric coefficient of the reflector: R=-850, k=-0.4, N=9, expansion coefficient X1Y0=0, X0Y1=0, X2Y0=-1.0, X1Y1=-0.008, X0Y2=-0.96, X3Y0=0.0003, X2Y1=-0.06, X1Y2=0.0009, X0Y3=-0.038.

[0058] Embodiment 3

[0059] Please refer to FIG. 2 , a display including a virtual display system according to one embodiment or the second embodiment, further comprising:

[0060] The display housing 2 is used to house a virtual display system according to either embodiment 1 or embodiment 2. The display housing 2 can also be mounted with a stand 4 and a camera 5 for video calls. The stand 4 can be used to secure the entire display and control vertical and tilt adjustments. The video call camera 5 is used for online video.

[0061] The main control module 3 is disposed within the display housing 2 and is connected to the display source 1 via a wired or wireless connection. Alternatively, the main control module 3 can be externally mounted as a conventional computer host, transmitting signals to the display source via HDMI and a data cable. In this embodiment, the main control module 3 can be a computer, which includes a motherboard that includes a graphics card, memory, a CPU, a fan, a hard drive, and the like.

[0062] Example 4

[0063] Please refer to FIG3 , which shows a display. The difference between this embodiment and the third embodiment is that the display in this embodiment can be inverted while achieving the same effect.

[0064] The above descriptions are only some embodiments of the present invention and do not limit the scope of protection of the present invention. Any equivalent device or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A virtual display system, characterized in that: A beam splitter and a concave mirror are arranged in sequence along the optical axis from the human eye side to the virtual image plane side, wherein the reflective surface of the beam splitter faces the concave mirror, and the concave surface of the concave mirror faces the beam splitter; the system further comprises: an image display source, which emits a light source along a first direction to the beam splitter; The system satisfies the following equation: 20°≤α≤40° 5°≤β≤22° 20°≤γ≤35° In the formula, α is the angle between the beam splitter and the direction perpendicular to the optical axis; β is the angle between the beam splitter and the direction perpendicular to the optical axis; γ is the angle between the image plane of the image display source and the mirror surface of the beam splitter.

2. A virtual display system as claimed in claim 1, characterized in that: The system satisfies the following equation: 3.5≤L1 / L2≤6.5 Wherein, L1 is the distance from the human eye side to the beam splitter in the optical axis direction; L2 is the distance between the beam splitter and the physical axis of the concave mirror.

3. A virtual display system as claimed in claim 1, characterized in that: The system satisfies the following equation: 1.85≤L1 / L3≤3.75 Wherein, L1 is the distance from the human eye side to the beam splitter in the optical axis direction; L3 is the distance from the beam splitter to the image plane of the image display source in the optical axis direction.

4. A virtual display system as claimed in claim 1, characterized in that: The surface of the concave mirror is a free-form surface, and the free-form surface satisfies the following formula: In the formula, z is the coordinate point in the direction of the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; N is the number of polynomial coefficients in the series; A i and E i Corresponding to the expansion coefficients of the polynomial terms in the x and y directions.

5. A virtual display system as claimed in claim 1, characterized in that: The surface of the concave mirror is a high-order aspheric surface, and the high-order aspheric surface satisfies the following formula: In the formula, z is the coordinate point in the direction of the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; α i (i=1, 2, 3…) is the corresponding aspheric coefficient.

6. A virtual display system as claimed in claim 1, characterized in that: The surface of the concave mirror is a high-order aspheric surface, and the high-order aspheric surface satisfies the following formula: In the formula, z is the coordinate point in the direction of the optical axis; c=1 / R, R is the radius of curvature of the concave mirror; r is the coordinate point; k is the quadratic constant of the surface; β i (i=1, 2, 3…) is the corresponding aspheric coefficient.

7. A virtual display system as claimed in claim 1, characterized in that: The system satisfies the following equation: 0≤h≤80mm Wherein, h is the distance between the physical axis of the concave mirror and the optical axis.

8. A virtual display system as claimed in claim 1, characterized in that: The system satisfies the following equation: 2m≤L≤8m 2.5m≤L1≤5.5m Wherein, L is the distance from the human eye side to the virtual image plane side in the optical axis direction; L1 is the distance from the human eye side to the beam splitter in the optical axis direction.

9. A virtual display system as claimed in claim 1, characterized in that: The tempered strength of the beam splitter is greater than or equal to 300 MPa.

10. A display, characterized in that: A virtual display system comprising any one of claims 1-9.

Images