Near-to-eye display system

Abstract

The embodiment of the utility model discloses a near-to-eye display system, which comprises a one-dimensional optical waveguide and an optical machine, a coupling-in area and a coupling-out area of the one-dimensional optical waveguide are arranged in a first direction, and the first direction is a pupil expansion direction of the one-dimensional optical waveguide; the optical machine is arranged towards the coupling-in area of the one-dimensional optical waveguide; the light machine comprises a display screen and a lens array, and the lens array is located on the light emitting side of the display screen. The lens array comprises a plurality of sub-lens systems, and the sub-lens systems are sequentially arranged in the second direction; the display screen is configured to display a plurality of sub-images with the same number as the sub-lens systems, the sub-images are located on the object space focal planes of the sub-lens systems in a one-to-one correspondence mode, gaps exist between the adjacent sub-images, and imaging in human eyes through the corresponding sub-lens systems is partially overlapped; the first direction is perpendicular to the second direction. According to the embodiment of the utility model, the problems that the coupling optical machine of the one-dimensional optical waveguide cannot be compatible with the advantages of small size, high brightness, large field angle, large pupil and the like, and is heavy, small in field angle and the like are solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technology, and in particular to a near-eye display system. Background Art

[0002] In existing one-dimensional optical waveguide coupling optical machines, the coupling part usually adopts a straight-through multi-lens or TIR prism deflection light path solution. The multi-lens solution usually adopts a glass, glass-plastic hybrid or pure plastic structure, but the structure is large in size and heavy in weight, and the achievable field of view is also very limited, which cannot meet the requirements of lightweight wearing; the TIR prism solution can be small in size and meet the requirements of lightweight, but usually requires matching free-form surfaces, and the processing cost is high. In addition, since the TIR prism is difficult to correct chromatic aberration, the chromatic aberration of complex light is large, which affects the actual viewing experience; and because the brightness loss of the waveguide is large and the light energy utilization rate itself is low, the existing traditional coupling methods cannot increase the brightness. In actual use, the low brightness is easy to cause eye fatigue, which reduces the consumer experience. Utility Model Content

[0003] The utility model provides a near-eye display system, so that a one-dimensional optical waveguide coupled optical machine can have the advantages of small size, high brightness, large field of view, large pupil, etc.

[0004] The present invention provides a near-eye display system, comprising:

[0005] A one-dimensional optical waveguide, comprising an incoupling region and an outcoupling region, wherein the incoupling region and the outcoupling region are arranged in a first direction, and the first direction is a pupil expansion direction of the one-dimensional optical waveguide;

[0006] An optical engine is arranged toward the coupling-in region of the one-dimensional optical waveguide; the optical engine comprises a display screen and a lens array, wherein the lens array is located on a light-emitting side of the display screen;

[0007] The lens array includes a plurality of sub-lens systems, which are sequentially arranged in the second direction; the display screen is configured to display a plurality of sub-images equal in number to the sub-lens systems, the sub-images being located on the object focal plane of each sub-lens system in a one-to-one correspondence, with gaps between adjacent sub-images and partial overlap in the images formed by the corresponding sub-lens systems in the human eye;

[0008] The first direction is perpendicular to the second direction.

[0009] Optionally, the plurality of sub-lens systems include a first sub-lens system, a second sub-lens system, and a third sub-lens system arranged in sequence in the first direction; and the plurality of sub-images include a first sub-image, a second sub-image, and a third sub-image arranged in sequence in the first direction.

[0010] The first sub-image is correspondingly located on the object focal plane of the first sub-lens system, the second sub-image is correspondingly located on the object focal plane of the second sub-lens system, and the third sub-image is correspondingly located on the object focal plane of the third sub-lens system;

[0011] In the second direction, the heights of the first sub-image, the second sub-image and the third sub-image are all h, the center line of the second sub-image is at the same height as the center axis of the second sub-lens system, the distance △h1 between the center line of the first sub-image and the center axis of the first sub-lens system satisfies 0<△h1<h, and / or the distance △h3 between the center line of the third sub-image and the center axis of the third sub-lens system satisfies 0<△h3<h.

[0012] Optionally, Δh1=h / 2, and / or, Δh3=h / 2.

[0013] Optionally, in the second direction, the first sub-lens system, the second sub-lens system and the third sub-lens system are adjacent to each other.

[0014] Optionally, in the second direction, the heights of the first sub-image, the second sub-image, and the third sub-image are all h; the apertures of the first sub-lens system, the second sub-lens system, and the third sub-lens system are all D';

[0015] Where D' = h / 2 + d;

[0016] Wherein, d is the distance between any two of the first sub-image, the second sub-image, and the third sub-image in the second direction.

[0017] Optionally, 1 mm ≤ D' ≤ 4 mm.

[0018] Optionally, 12 mm ≤ 2D'×f / h ≤ 15 mm; wherein f is the focal length of the first sub-lens system, the second sub-lens system, and the third sub-lens system.

[0019] Optionally, each of the sub-lens systems includes at least one sub-lens arranged along the optical axis.

[0020] Optionally, the surface shapes of the sub-lenses in different sub-lens systems are the same or different.

[0021] Optionally, it also includes a pupil detection sensor, a controller and a driving mechanism;

[0022] The controller includes a pupil information receiving end and a display screen position control end, the controller is electrically connected to the pupil detection sensor via the pupil information receiving end, and is electrically connected to the driving mechanism via the display screen position control end;

[0023] The pupil detection sensor is configured to detect the center position of the pupil, and the controller is configured to control the driving mechanism to drive the display screen to move in the second direction relative to the lens array based on the center position of the pupil, so that the central optical axis of the display screen passes through the lens array and is incident on the center position of the pupil.

[0024] The technical solution of the present utility model solves the problem that the coupling optical machine of one-dimensional optical waveguide cannot be compatible with the advantages of small size, high brightness, large field of view, large pupil, etc., and has the problems of being bulky and having a small field of view. Sub-images are spliced ​​by means of a small lens array, thereby improving the resolution of the observed image; sub-images of corresponding areas are imaged respectively by small lenses, and the shortening of the focal length of a single lens can reduce the size of the coupling optical machine, thereby achieving the advantage of being light to wear; the field of view in the non-pupil expansion direction is increased by repeated splicing between separate sub-images, thereby increasing the dynamic observation distance of the eye-relief, and the increase in field of view brightness can be achieved according to different image splicing widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a schematic structural diagram of a near-eye display system provided by an embodiment of the present invention in the XOZ plane;

[0026] Figure 2 yes Figure 1 The schematic diagram of the structure of the near-eye display system in the YOZ plane is shown;

[0027] Figure 3 yes Figure 1 and Figure 2 The optical imaging principle diagram of the near-eye display system shown;

[0028] Figure 4 yes Figure 1 and Figure 2 Schematic diagram of viewing effect of the near-eye display system shown;

[0029] Figure 5-Figure 8 Schematic diagrams of the structures of four near-eye display systems provided by embodiments of the present invention;

[0030] Figures 9-11 Schematic diagrams of the structures of three other near-eye display systems provided by embodiments of the present invention in the YOZ plane;

[0031] Figure 12 This is a structural diagram of another near-eye display system provided by an embodiment of the present utility model;

[0032] In the picture:

[0033] 10- one-dimensional optical waveguide, 110- coupling-in region, 120- coupling-out region;

[0034] 20 - Optical machine, 21 - Display screen, 210 - Sub-image, 211 - First sub-image, 212 - Second sub-image, 213 - Third sub-image; 22 - Lens array, 220 - Sub-lens system, 221 - First sub-lens system, 222 - Second sub-lens system, 223 - Third sub-lens system;

[0035] 30 - pupil detection sensor, 40 - controller, 50 - driving mechanism. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0037] Figure 1 This is a schematic structural diagram of a near-eye display system provided by an embodiment of the present invention in the XOZ plane. Figure 2 yes Figure 1 The schematic diagram of the structure of the near-eye display system in the YOZ plane is shown in FIG. Figure 1 and Figure 2 The near-eye display system includes a one-dimensional optical waveguide 10 and an optical engine 20; the one-dimensional optical waveguide 10 includes a coupling-in region 110 and a coupling-out region 120, and the coupling-in region 110 and the coupling-out region 120 are arranged in a first direction X, and the first direction X is the pupil expansion direction of the one-dimensional optical waveguide 10; the optical engine 20 is arranged toward the coupling-in region 110 of the one-dimensional optical waveguide 10; the optical engine 20 includes a display screen 21 and a lens array 22, and the lens array 22 is located on the light-emitting side of the display screen 21.

[0038] The lens array 22 includes a plurality of sub-lens systems 220, which are arranged sequentially in a second direction Y. The display screen 21 is configured to display a plurality of sub-images 210, the same number as the sub-lens systems 220. The sub-images 210 are located one-to-one on the object focal plane of each sub-lens system 220. There are gaps between adjacent sub-images 210, and the images formed by the corresponding sub-lens systems 220 in the human eye partially overlap. The first direction X is perpendicular to the second direction Y.

[0039] First, for ease of understanding, the three-dimensional space where the near-eye display system in this embodiment is located is defined by a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other, thereby forming an XOZ plane and a YOZ plane. Figure 1is the view of the near-eye display system in the XOZ plane, Figure 2 This is a view of the near-eye display system in the YOZ plane. Figure 1 and Figure 2 As shown, in this near-eye display system, a one-dimensional optical waveguide 10 is responsible for geometrically transferring the image projected by the optical engine 20 and then transmitting the image to the human eye, thereby achieving a virtual display effect. Those skilled in the art will understand that a one-dimensional optical waveguide 10 is an optical device that constrains the propagation of light in a single dimension. Specifically, it restricts the propagation of light in a first direction X, while not restricting the propagation in a second direction Y or a third direction X. For near-eye display systems, the one-dimensional optical waveguide 10 can increase the field of view and exit pupil uniformity, and its pupil expansion direction is the first direction X.

[0040] In this embodiment, a display screen 21 and a lens array 22 are provided within the optical engine 20. The display screen 21 is responsible for displaying images, and displays them in the form of multiple sub-images 210. The lens array 22, comprised of multiple sub-lens systems 220 arranged in a second direction Y, is responsible for projecting each sub-image 210 onto the coupling region 110 of the one-dimensional optical waveguide 10, thereby transmitting each sub-image 210 through the one-dimensional optical waveguide 10 to the human eye. Furthermore, in this embodiment, the sub-images 210 and the sub-lens systems 220 are arranged in the second direction Y to display the multiple sub-images 210 in a direction perpendicular to the pupil expansion direction of the one-dimensional optical waveguide 10. Through the appropriate arrangement of the sub-lens systems 220, a partially overlapping viewing effect is achieved after each sub-image 210 is transmitted through the one-dimensional optical waveguide 10 to the human eye.

[0041] Figure 3 yes Figure 1 and Figure 2 The optical imaging principle diagram of the near-eye display system shown in the figure is as follows: Figure 4 yes Figure 1 and Figure 2 The viewing effect diagram of the near-eye display system is shown below. Figure 3 and Figure 4 , the imaging principle of the embodiment of the utility model is introduced: Figure 3As shown, the green, blue, and red light rays represent the light emitted from the upper, middle, and lower regions of each sub-image 210, respectively. After passing through their corresponding sub-lens systems 220, they can form parallel light rays in different directions that enter the human pupil D. Furthermore, these parallel light rays are imaged onto different regions of the retina through the human pupil D. For example, for the upper sub-image 210, the green, blue, and red light rays pass through the corresponding sub-lens systems 220 to form parallel light rays in green, red, and blue directions, respectively, that enter the human pupil D. These parallel light rays then pass through the human pupil D to form inverted images that are reflected on different regions of the retina. After processing by the human brain, the upper sub-image 210 is viewed upright. Similarly, for the middle and lower sub-images 210, after passing through their corresponding sub-lens systems 220, these sub-images 210 are also inverted and reflected on different regions of the retina, resulting in an upright viewing effect. Since the corresponding set of sub-lens systems 220 and sub-image 210, when the sub-lens system 220 is moved relative to the sub-image 210 in the second direction Y, the imaging position of the sub-image 210 will change synchronously in the second direction Y, therefore, by reasonably setting the position of each sub-lens system 220, it can be achieved that different sub-images 210 partially overlap when they are inverted on the retina, that is, as shown in FIG. Figure 4 As shown, this creates a partially overlapping viewing effect between the sub-images 210. This arrangement, on the one hand, expands the field of view in the vertical pupil expansion direction, thereby enlarging the pupil. At the same time, because each sub-lens system 220 is relatively small and has a short focal length, the display screen 21 is placed at a shorter distance from the lens array 22 when it is on the object focal plane of the sub-lens system 220, reducing the size of the optical engine 20 and contributing to a more lightweight near-eye display system. Furthermore, when the sub-images 210 create a partially overlapping viewing effect, the brightness of some areas of the overall display screen can be increased, improving light energy utilization, reducing user eye fatigue, and enhancing the consumer experience.

[0042] It should be added that the viewing effect of partial overlap between the sub-images 210 is related to the relative position of the sub-lens system 220 and the sub-image 210. At the same time, when there is partial overlap between the sub-images 210, the overlapping areas of the two partially overlapping sub-images 210 are also required to display the same picture. In this way, while achieving brightness superposition, the clarity of the picture is guaranteed and the problem of crosstalk caused by displaying different pictures is avoided.

[0043] The above technical solution is provided in a near-eye display system, wherein the one-dimensional optical waveguide includes a coupling-in region and a coupling-out region, and the coupling-in region and the coupling-out region are arranged in a first direction, which is the pupil expansion direction of the one-dimensional optical waveguide; the optical machine is arranged toward the coupling-in region of the one-dimensional optical waveguide; the optical machine includes a display screen and a lens array, and the lens array is located on the light-emitting side of the display screen; the lens array includes a plurality of sub-lens systems, and the plurality of sub-lens systems are arranged in sequence in a second direction; the display screen is configured to display a plurality of sub-images having the same number as the sub-lens systems, and the sub-images are located one-to-one on the object focal plane of each sub-lens system, and there are gaps between adjacent sub-images and the images formed by the corresponding sub-lens systems in the human eye partially overlap; wherein the first direction is perpendicular to the second direction. The embodiment of the present utility model solves the problem that the coupling optical machine of the one-dimensional optical waveguide cannot be compatible with the advantages of small size, high brightness, large field of view, large pupil, etc., and has the problems of being bulky and having a small field of view. Sub-images are spliced ​​by means of a small lens array, thereby improving the resolution of the observed image; sub-images of corresponding areas are imaged respectively by small lenses, and the shortening of the focal length of a single lens can reduce the size of the coupling optical machine, thereby achieving the advantage of being light to wear; the field of view in the non-pupil expansion direction is increased by repeated splicing between separate sub-images, thereby increasing the dynamic observation distance of the eye-relief, and the increase in field of view brightness can be achieved according to different image splicing widths.

[0044] Continue to refer Figure 1-Figure 4 In a specific embodiment, the plurality of sub-lens systems 220 include a first sub-lens system 221, a second sub-lens system 222, and a third sub-lens system 223 arranged sequentially in the first direction X; the plurality of sub-images 210 include a first sub-image 211, a second sub-image 212, and a third sub-image 213 arranged sequentially in the first direction X. The first sub-image 211 is located on the object focal plane of the first sub-lens system 221, the second sub-image 212 is located on the object focal plane of the second sub-lens system 222, and the third sub-image 213 is located on the object focal plane of the third sub-lens system 223.

[0045] In the second direction Y, the heights of the first sub-image 211, the second sub-image 212 and the third sub-image 213 are all h, the center line of the second sub-image 212 is at the same height as the center axis of the second sub-lens system 222, the distance △h1 between the center line of the first sub-image 211 and the center axis of the first sub-lens system 221 satisfies 0<△h1<h, and / or, the distance △h3 between the center line of the third sub-image 213 and the center axis of the third sub-lens system 223 satisfies 0<△h3<h.

[0046] First, the first sub-lens system 221 and the third sub-lens system 223 are located on either side of the second sub-lens system 222 in the second direction Y. Correspondingly, the first sub-image 211 and the third sub-image 213 are also located on either side of the second sub-image 212 in the second direction Y. The position of the first sub-image 211 relative to the first sub-lens system 221, and the position of the third sub-image 213 relative to the third sub-lens system 223, determine the imaging positions of the first sub-image 211 and the third sub-image 213, and therefore, whether they overlap with the second sub-image 212 and the size of the overlapping area. The following uses the first sub-image 211 and the first sub-lens system 221 as an example to describe how their relative positional relationship affects whether or not they overlap and the size of the overlapping area.

[0047] Figure 5-Figure 8 Schematic diagram of the structure of four near-eye display systems provided by the embodiment of the present utility model, wherein: Figure 5-Figure 8 The four near-eye display systems have the same point in that the center line of the second sub-image 212 and the center axis of the second sub-lens system 222 are at the same height, while the difference is that the distance between the first sub-image 211 and the second sub-image 212 gradually increases. More precisely, the distance △h1 between the center line of the first sub-image 211 and the center axis of the first sub-lens system 221 gradually increases in the four near-eye display systems. Figure 5 In the illustrated near-eye display system, the distance Δh1 between the centerline of first sub-image 211 and the central axis of first sub-lens system 221 is minimal, Δh1 = 0. This means that the centerline of first sub-image 211 and the central axis of first sub-lens system 221 are at the same height. In this configuration, the light paths of first sub-image 211 and second sub-image 212 are parallel after passing through their corresponding sub-lens systems 220. After passing through the pupil of the human eye, they are imaged at the same location on the retina, resulting in complete overlap. Figure 6 、 Figure 7 and Figure 8 The near-eye display systems shown are three types of near-eye display systems formed when the first sub-image 211 is moved upward relative to the first sub-lens system 221 to different degrees. Figure 6 In the near-eye display system shown, the distance Δh1 between the center line of the first sub-image 211 and the center axis of the first sub-lens system 221 satisfies 0<Δh1<h / 2; Figure 7 In the near-eye display system shown, the distance △h1 between the center line of the first sub-image 211 and the center axis of the first sub-lens system 221 satisfies △h1=h / 2; Figure 8 In the near-eye display system shown, a distance Δh1 between the center line of the first sub-image 211 and the center axis of the first sub-lens system 221 satisfies Δh1=h.

[0048] relatively Figure 5For the near-eye display system shown, Figure 6 In the near-eye display system shown, since 0<△h1<h / 2, the first sub-image 211 moves slightly upward relative to the first sub-lens system 221. As a result, when imaging on the retina of the human eye, the first sub-image 211 moves downward relative to the second sub-image 212, thereby causing the first sub-image 211 and the second sub-image 212 to partially overlap instead of completely overlapping, and a small amount of the upper edge area of ​​the first sub-image 211 no longer overlaps with the second sub-image 212.

[0049] relatively Figure 6 For the near-eye display system shown, Figure 7 In the near-eye display system shown, since △h1=h / 2, the first sub-image 211 moves upward by half the length relative to the first sub-lens system 221. Therefore, when imaging on the retina of the human eye, the first sub-image 211 moves downward by half the length relative to the second sub-image 212, thereby causing the first sub-image 211 and the second sub-image 212 to overlap half instead of partially overlapping.

[0050] relatively Figure 7 For the near-eye display system shown, Figure 8 In the near-eye display system shown, since △h1=h, the first sub-image 211 moves upward by the entire length relative to the first sub-lens system 221. As a result, when imaging on the retina of the human eye, the first sub-image 211 moves downward by the entire length relative to the second sub-image 212, thereby changing the effect of the first sub-image 211 and the second sub-image 212 from overlapping by half to being exactly spliced ​​without overlapping.

[0051] In summary, in this embodiment, setting 0<△h1<h is essentially to limit the position of the first sub-image 211 relative to the first sub-lens system 221, thereby ensuring that the first sub-image 211 can have an overlapping area with the second sub-image 212, thereby achieving the effect of increasing brightness, thereby improving the utilization rate of light energy, reducing user eye fatigue, and improving consumer experience.

[0052] It can be understood that the setting logic for the third sub-image 213 and the third sub-lens system 223 is similar. The only difference is that the third sub-image 213 is moved downward relative to the second sub-image 212, and the center line of the third sub-image 213 is located below the center axis of the third sub-lens system 223. When the distance △h3 satisfies 0<△h3<h, the position of the third sub-image 213 relative to the third sub-lens system 223 is also limited to ensure that the third sub-image 213 can have an overlapping area with the second sub-image 212, thereby achieving the effect of increased brightness, thereby improving the utilization rate of light energy, reducing user eye fatigue, and improving consumer experience.

[0053] Continue to refer Figure 7 In an optional embodiment of the near-eye display system shown, Δh1 can be set to h / 2, thereby creating a half-overlap effect between the first sub-image 211 and the second sub-image 212. Furthermore, Δh3 can be set to h / 2, thereby creating a half-overlap effect between the third sub-image 213 and the second sub-image 212. This results in an overall brightness boost for the second sub-image 212. This can increase the brightness of the central area of ​​the entire image, where the user's attention is highest, thereby reducing eye fatigue and improving the consumer experience.

[0054] Depend on Figure 5-Figure 8 Analysis of the illustrated near-eye display system reveals that the overlap effect between sub-images 210 primarily depends on the positional relationship between the sub-images 210 and the corresponding sub-lens systems 220; the positional relationship between the sub-lens systems 220 does not affect the overlap effect. Furthermore, to reduce the overall volume of the near-eye display system and improve space utilization, the first sub-lens system 221, the second sub-lens system 222, and the third sub-lens system 223 are optionally adjacent to each other in the second direction Y. This eliminates gaps between the sub-lens systems 220, allowing the overall system volume to be appropriately reduced in the second direction Y, thereby improving the system's portability.

[0055] Further optionally, in the second direction Y, the heights of the first sub-image 211, the second sub-image 212 and the third sub-image 213 are all h; the apertures of the first sub-lens system 221, the second sub-lens system 222 and the third sub-lens system 223 are all D'; wherein D'=h / 2+d; wherein d is the distance between any two of the first sub-image 211, the second sub-image 212 and the third sub-image 213 in the second direction Y.

[0056] At this time, based on the edge adjacency of the three sub-lenses, D'=h / 2+d, which is essentially equivalent to the distance △h1 between the center line of the first sub-image 211 and the center axis of the first sub-lens system 221 being h / 2, and the distance △h3 between the center line of the third sub-image 213 and the center axis of the third sub-lens system 223 being h / 2. At this time, the first sub-image 211 and the second sub-image 212 can produce an overlapping effect of half the length, and the third sub-image 213 and the second sub-image 212 can also produce an overlapping effect of half the length. For the second sub-image 212, the overall brightness improvement effect can be obtained. For the near-eye display system, the brightness of the middle area of ​​the entire screen that the user pays more attention to can be increased, thereby reducing the user's eye fatigue and improving the consumer experience.

[0057] In a specific implementation process, the apertures D′ of the first sub-lens system 221 , the second sub-lens system 222 and the third sub-lens system 223 may be set to 1 mm ≤ D′ ≤ 4 mm.

[0058] Those skilled in the art will appreciate that, for the lens arrays of the three sub-lens systems 220, in order for the human eye to precisely fit within the lens arrays and fully receive the image formed by the lens arrays without the human pupil blocking light from the edge regions, or without the human pupil being able to see images outside the display screen, the lens arrays of the three sub-lens systems 220 must satisfy 2D' = D, where D represents the size of the human pupil. Based on the human pupil size range of 2 to 8 mm, the aperture D' of the first sub-lens system 221, the second sub-lens system 222, and the third sub-lens system 223 can be set to 1 to 4 mm.

[0059] In a specific implementation process, 12 mm ≤ 2D′×f / h ≤ 15 mm may be set; wherein f is the focal length of the first sub-lens system 221 , the second sub-lens system 222 and the third sub-lens system 223 .

[0060] Continue to refer Figure 2 The field of view of the near-eye display system that uses the lens array to realize imaging is θ, θ=2β, and the field of view angle β satisfies: tanβ=D / L=h / f; wherein L is the visual distance. And when 2D'=D is set, it can be obtained that L=2D'×f / h. Since the visual distance of a normal near-eye display system is 12 to 15 mm, when setting the sub-lens system 220, it is necessary to set it according to 12mm≤2D'×f / h≤15mm, so that the human eye can just adapt to the lens array and just completely receive the imaging of the lens array without being shielded by the human pupil from the light in the edge area, or the human pupil will not see the image outside the display screen, and at the same time, ensure that the human eye has a more comfortable visual distance.

[0061] Figures 9-11 This is a schematic diagram of the structure of three other near-eye display systems provided by the embodiment of the present invention in the YOZ plane, refer to Figure 2 、 Figures 9-11 In different embodiments, each sub-lens system 220 may optionally include at least one sub-lens arranged along the optical axis. Figure 10 and Figure 11 As shown, each sub-lens system 220 may include two sub-lenses.

[0062] Further, continue to refer to Figure 2 、 Figures 9-11 In different embodiments, optionally, the surface shapes of the sub-lenses in different sub-lens systems 220 are the same or different.

[0063] Specifically, the surface shape of the sub-lens may include a spherical surface, an aspheric surface, a free-form surface, a diffractive surface, etc. The sub-lens system 220 in the embodiment of the present invention may adopt the above different surface shapes.

[0064] For example, Figure 9 As shown, the middle sub-lens and the sub-lenses on both sides can adopt different surface shapes. Figure 11 As shown, when the sub-lens system 220 includes two or more sub-lenses, the surface shapes of the sub-lenses in the same sub-lens system 220 may also be different.

[0065] Figure 12 This is a schematic diagram of the structure of another near-eye display system provided by an embodiment of the present invention, referring to Figure 12 Based on the near-eye display system of the above embodiment, in an optional embodiment, a pupil detection sensor 30, a controller 40 and a driving mechanism 50 may be added to the near-eye display system; the controller 40 includes a pupil information receiving end and a display screen position control end, and the controller 40 is electrically connected to the pupil detection sensor 30 through the pupil information receiving end, and is electrically connected to the driving mechanism 50 through the display screen position control end.

[0066] The pupil detection sensor 30 is configured to detect the center position of the pupil, and the controller 40 is configured to control the driving mechanism 50 to drive the display screen 21 to move relative to the lens array in the second direction Y according to the center position of the pupil, so that the central optical axis of the display screen 21 passes through the lens array and is incident on the center position of the pupil.

[0067] refer to Figure 12In the illustrated near-eye display system, the centerline of the second sub-image 212 coincides with the central axis of the second sub-lens system 222 in the second direction Y. This configuration applies only when the human eye is located in the center of the lens array imaging area. In this case, in the second direction Y, the three sub-images 210 are more evenly incident on the human eye through the corresponding sub-lens systems 220, preventing the human eye from receiving too much of the first sub-image 211 or the third sub-image 213, ensuring that the displayed image is incident on the human eye in its entirety or at least in a centered manner. It is understood that different users have different eye structures, wearing conditions, and other factors, which may result in a certain deviation in the pupil position relative to the lens array. To ensure that the displayed image is incident on the pupil in a centered manner, a pupil detection sensor 30 is provided in this embodiment to detect the pupil center position of different users. The controller 40 then controls the drive mechanism 50 to adjust the position of the display screen 21 in the second direction Y so that its central optical axis is incident on the center of the human pupil. This ensures that the human eye can obtain the entire image or at least the image in the centered area when viewing, adapting to the viewing needs of different users and improving viewing comfort. It should be noted that the drive mechanism 50 adjusts the position of the display screen 21 in the second direction Y using the position of the centerline of the second sub-image 212 relative to the central axis of the second sub-lens system 222 as an adjustment reference. For example, when the user's pupil is positioned upward, the display screen 21 is adjusted as a whole so that the centerline of the second sub-image 212 moves downward relative to the central axis of the second sub-lens system 222, thereby causing the image, after being imaged by the lens array, to be incident on the upward-positioned pupil. Conversely, when the user's pupil is positioned downward, the display screen 21 is adjusted as a whole so that the centerline of the second sub-image 212 moves upward relative to the central axis of the second sub-lens system 222, thereby causing the image, after being imaged by the lens array, to be incident on the downward-positioned pupil. The specific adjustment distance depends on the position of the pupil center relative to the central axis, as well as the optical parameters of the sub-lens system 220 imaging and the transfer parameters of the one-dimensional optical waveguide. Those skilled in the art can deduce and calculate accordingly, and this is not a limitation here.

[0068] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A near-eye display system, characterized in that: include: A one-dimensional optical waveguide, comprising an incoupling region and an outcoupling region, wherein the incoupling region and the outcoupling region are arranged in a first direction, and the first direction is a pupil expansion direction of the one-dimensional optical waveguide; An optical engine is arranged toward the coupling-in region of the one-dimensional optical waveguide; the optical engine comprises a display screen and a lens array, wherein the lens array is located on a light-emitting side of the display screen; The lens array includes a plurality of sub-lens systems, which are sequentially arranged in the second direction; the display screen is configured to display a plurality of sub-images equal in number to the sub-lens systems, the sub-images being located on the object focal plane of each sub-lens system in a one-to-one correspondence, with gaps between adjacent sub-images and partial overlap in the images formed by the corresponding sub-lens systems in the human eye; The first direction is perpendicular to the second direction.

2. The near-eye display system according to claim 1, wherein: The plurality of sub-lens systems include a first sub-lens system, a second sub-lens system, and a third sub-lens system arranged in sequence in the first direction; the plurality of sub-images include a first sub-image, a second sub-image, and a third sub-image arranged in sequence in the first direction; The first sub-image is correspondingly located on the object focal plane of the first sub-lens system, the second sub-image is correspondingly located on the object focal plane of the second sub-lens system, and the third sub-image is correspondingly located on the object focal plane of the third sub-lens system; In the second direction, the heights of the first sub-image, the second sub-image and the third sub-image are all h, the center line of the second sub-image is at the same height as the center axis of the second sub-lens system, the distance △h1 between the center line of the first sub-image and the center axis of the first sub-lens system satisfies 0<△h1<h, and / or the distance △h3 between the center line of the third sub-image and the center axis of the third sub-lens system satisfies 0<△h3<h.

3. The near-eye display system according to claim 2, wherein: Δh1=h / 2, and / or, Δh3=h / 2.

4. The near-eye display system according to claim 2, wherein: In the second direction, the first sub-lens system, the second sub-lens system and the third sub-lens system are adjacent to each other.

5. The near-eye display system according to claim 4, wherein: In the second direction, the heights of the first sub-image, the second sub-image, and the third sub-image are all h; the apertures of the first sub-lens system, the second sub-lens system, and the third sub-lens system are all D'; Where D' = h / 2 + d; Wherein, d is the distance between any two of the first sub-image, the second sub-image, and the third sub-image in the second direction.

6. The near-eye display system according to claim 5, wherein: 1mm≤D'≤4mm.

7. The near-eye display system according to claim 5, wherein: 12mm≤2D'×f / h≤15mm; wherein f is the focal length of the first sub-lens system, the second sub-lens system, and the third sub-lens system.

8. The near-eye display system according to claim 1, wherein: Each of the sub-lens systems includes at least one sub-lens arranged along the optical axis.

9. The near-eye display system according to claim 8, wherein: The surface shapes of the sub-lenses in different sub-lens systems are the same or different.

10. The near-eye display system according to claim 1, wherein: Also included are a pupil detection sensor, a controller, and a drive mechanism; The controller includes a pupil information receiving end and a display screen position control end, the controller is electrically connected to the pupil detection sensor via the pupil information receiving end, and is electrically connected to the driving mechanism via the display screen position control end; The pupil detection sensor is configured to detect the center position of the pupil, and the controller is configured to control the driving mechanism to drive the display screen to move in the second direction relative to the lens array based on the center position of the pupil, so that the central optical axis of the display screen passes through the lens array and is incident on the center position of the pupil.

Images