Retinal projection apparatus and near-eye display device
By setting multiple light-emitting zones and viewpoint positions in the retinal projection device, the problems of small exit pupil and interpupillary distance adaptation are solved, and the continuity and integrity of the image are achieved during human eye rotation, adapting to the usage needs of different users and improving the user experience of near-eye display devices.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG SHENGYI OPTICAL SENSING TECH CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-02
Smart Images
Figure CN224317856U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of near-eye display technology, and in particular to a retinal projection device and a near-eye display equipment. Background Technology
[0002] With the development of near-eye display technology, retinal projection technology has emerged. Retinal projection near-eye displays utilize optical elements such as lenses to focus the light emitted by a light-emitting unit, carrying a virtual image. The beam is focused into a point at the pupil of the human eye and then directly projected onto the retina. Retinal projection near-eye displays can greatly reduce the role of the lens in the human eye's observation process. Ideally, the human eye observes a full-focus image, and regardless of how the lens is focused, the human eye can see a clear virtual image. This effectively solves the focusing and convergence conflict problem in near-eye displays, greatly reducing the risk of visual fatigue and dizziness caused by prolonged use of near-eye display devices. However, because the light is converged to a single point during the imaging process of retinal projection, the exit pupil is relatively small. This makes it easy for the human eye to lose focus when moving, as the virtual image light source may not be able to reach the eye. Furthermore, the convergence point of the light is relatively fixed, making it difficult to adapt to different interpupillary distances. Utility Model Content
[0003] Therefore, it is necessary to provide a retinal projection device and a near-eye display device to address the problems of small exit pupil and difficulty in adapting to various interpupillary distances in existing retinal projection near-eye displays.
[0004] On one hand, this application provides a retinal projection device, including: an optical engine assembly, the optical engine assembly including a plurality of light-emitting zones for emitting image light carrying a locally displayed image; and an eye-viewing element, the eye-viewing element having a plurality of viewpoint positions, one of the light-emitting zones corresponding to one of the viewpoint positions, the eye-viewing element being disposed on the light-emitting side of the optical engine assembly for reflecting the image light output through each of the light-emitting zones, so as to form a plurality of independent viewpoints for projection onto the retina at each of the viewpoint positions.
[0005] In one embodiment, a plurality of the viewpoint positions are arranged in an array to form an eye-entry zone corresponding to the pupil of the human eye.
[0006] In one embodiment, the distance between two adjacent viewpoint positions is at most 1 mm.
[0007] In one embodiment, the distance between the viewpoint and the eye-viewing element is at most 12 mm.
[0008] In one embodiment, the eye-viewing element has 81 viewpoint positions, which are arranged in a 9×9 array.
[0009] In one embodiment, the horizontal field of view and the vertical field of view of the eye-entry element are 42° and 28°, respectively, and the horizontal field of view and the vertical field of view of the eye-entry zone are both 16°.
[0010] In one embodiment, the eye-viewing element is a volume holographic optical element or a liquid crystal holographic optical element.
[0011] In one embodiment, the retinal projection device further includes an eye-tracking module communicatively connected to the optomechanical assembly.
[0012] In one embodiment, the optomechanical assembly includes a laser light source and a MEMS element, wherein the laser light source is disposed on the incident side of the MEMS element and the eye-viewing element is disposed on the reflective side of the MEMS element.
[0013] On the other hand, this application provides a near-eye display device, including: a retinal projection device as described in any of the above; and a device body, wherein the retinal projection device is mounted on the device body.
[0014] In summary, the retinal projection device of this application divides a complete display image into multiple partial display images by setting multiple light-emitting zones and multiple viewpoint positions corresponding to the light-emitting zones. Each viewpoint position forms an independent viewpoint that can display a corresponding partial display image. During the movement of the human eye, the eye-entry element can cover the range of human eye movement, ensuring that there is always an eye-entry zone corresponding to the pupil of the human eye, and ensuring that the human eye can always see the partial display image. In addition, the multiple viewpoint positions can also adapt to human eyes with different interpupillary distances, meeting the usage needs of different user groups. Attached Figure Description
[0015] Figure 1 A schematic diagram of a retinal projection device provided for one embodiment of this application;
[0016] Figure 2 A schematic diagram of an image of a retinal projection device according to the above embodiments of this application is shown;
[0017] Figure 3 A viewpoint schematic diagram of a retinal projection device according to the above embodiments of this application is shown;
[0018] Figure 4 A schematic diagram of the light-emitting zones of the retinal projection device according to the above embodiments of this application is shown.
[0019] Reference numerals: 10, Optomechanical assembly; 11, Light emission zone; 20, Eye-entry element; 21, Viewpoint position; 22, Eye-entry zone; 210, Independent viewpoint; 30, Human eye. Detailed Implementation
[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0024] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0026] To address the issues of small exit pupils and difficulty in adapting to various interpupillary distances in existing retinal projection near-eye displays, this application provides a retinal projection device and a near-eye display apparatus. This retinal projection device employs a viewpoint segmentation method, which expands the exit pupil, thereby overcoming the disadvantage of small pupils in retinal projection near-eye displays.
[0027] Please refer to Figure 1 , Figure 2 and Figure 4 On one hand, this application provides a retinal projection device, which may include an optical engine assembly 10 and an eye-viewing element 20. The optical engine assembly 10 may include a plurality of light-emitting zones 11, each capable of emitting image light carrying a display image. One light-emitting zone 11 corresponds to a partial display image, and multiple partial display images can be combined to form a complete display image. The eye-viewing element 20 has a plurality of viewpoint positions 21, and each light-emitting zone 11 corresponds to at least one viewpoint position 21. The eye-viewing element 20 is disposed on the light-emitting side of the optical engine assembly 10 and is used to reflect the image light output through each light-emitting zone 11 to form a plurality of independent viewpoints 210 at each viewpoint position 21 for projection onto the retina. The human eye 30 can see the partial display image formed by the image light output from the corresponding light-emitting zone 11 at each independent viewpoint 210.
[0028] Understandably, when the human eye 30 is looking directly at the screen, the independent viewpoint 210 formed by the viewpoint position 21 can be projected onto the retina of the human eye 30. The combination of multiple independent viewpoints 210 enables the human eye to see the displayed image. When the human eye 30 rotates at a certain angle, the position of the pupil of the human eye 30 changes, and the viewpoint position 21 that can enter the human eye 30 changes. The image light emitted by the light-emitting partition 11 corresponding to the viewpoint position 21 after the change forms a new independent viewpoint 210 on the retina of the human eye 30, so that the human eye 30 can see the displayed image at the rotated position.
[0029] In this way, the retinal projection device of this application divides the complete display image into multiple partial display images by setting multiple light-emitting zones 11 and multiple viewpoint positions 21 corresponding to the light-emitting zones 11. Each viewpoint position 21 forms an independent viewpoint 210 that can display the partial display image accordingly. During the rotation of the human eye 30, the eye-entry element 20 can cover the rotation range of the human eye 30, ensuring that there is always an eye-entry zone 22 corresponding to the pupil of the human eye 30, and ensuring that the human eye 30 can always see the partial display image. In addition, the multiple viewpoint positions 21 can also adapt to human eyes 30 with different interpupillary distances, meeting the usage needs of different user groups.
[0030] Optionally, in some embodiments, multiple viewpoint positions 21 are arranged in an array to form an eye-entry partition 22 corresponding to the pupil of the human eye 30. Individual viewpoints 210 formed at viewpoint positions 21 within the eye-entry partition 22 can all be projected onto the retina of the human eye, and the partial display images displayed by each individual viewpoint 210 can be combined to form a complete display image. In this way, the human eye always sees a complete display image during eye movement, and by arranging the viewpoint positions 21 in an array, multiple individual viewpoints 210 can be arranged within the limited pupil area of the human eye 30, providing a sufficient number of individual viewpoints 210 to ensure the continuity and integrity of the image during eye movement.
[0031] Optionally, since the pupil diameter of the human eye 30 is typically 4mm, in order to ensure that as many independent viewpoints 210 as possible are projected onto the retina of the human eye 30, such as Figure 3 As shown, in some embodiments, the distance between two adjacent viewpoint positions 21 is at most 1 mm. In this way, the distance between two adjacent independent viewpoints 210 does not exceed 1 mm, and 3×3 independent viewpoints 210 can be projected onto the retina of the human eye 30, thereby accurately matching the physiological characteristics of the human eye and ensuring that the human eye 30 can see the complete display image.
[0032] Normally, the distance between the viewpoint 21 and the eye-entry element 20 affects the field of view. As the distance increases, the rotation angle of the human eye 30 covered by the eye-entry element 20 decreases, thus limiting the size of the field of view of the eye-entry element 20. Figure 1As shown, in some embodiments, the distance between the viewpoint position 21 and the eye-entry element 20 is at most 12 mm. In this way, by controlling the distance between the viewpoint position 21 and the eye-entry element 20, while keeping the rotation angle of the human eye 30 constant, the independent viewpoint 210 can be projected onto the retina of the human eye 30 as much as possible, ensuring that the eye-entry element 20 can cover the rotation angle range of the human eye 30.
[0033] Optionally, during the rotation of the human eye 30, the maximum rotation angle is generally 30°. To ensure that an independent viewpoint 210 is always projected onto the retina of the human eye 30, such as... Figure 3 As shown, in some embodiments, the eye-viewing component has 81 viewpoint positions 21, which are arranged in a 9×9 array. In this way, the arrangement range of the viewpoint positions 21 can cover the range of rotation of the human eye 30, thereby ensuring that an independent viewpoint 210 is always projected onto the retina of the human eye 30 during the rotation of the human eye 30, which is also more in line with the observation habits of the human eye 30.
[0034] For example, such as Figure 3 As shown, the eye-entry element 20 includes 81 viewpoint positions 21, each viewpoint position 21 is spaced 1mm apart, and each viewpoint position 21 is arranged in a 9×9 array. Thus, the exit pupil range of the eye-entry element 20 is a square range of 8mm×8mm, and the interpupillary distance range that can be adapted is 60mm to 68mm.
[0035] Optionally, such as Figure 2 As shown, when the human eye 30 rotates, the position of the eye-entry section 22 corresponding to the pupil of the human eye 30 on the eye-entry element 20 changes. For example, when the human eye 30 rotates to the left, the position of the eye-entry section 22 on the eye-entry element 20 changes to the left. In some embodiments, the horizontal and vertical field of view of the eye-entry element 20 are 42° and 28°, respectively, and the horizontal and vertical field of view of the eye-entry section 22 are both 16°. Thus, the horizontal and vertical field of view of the range of rotation of the human eye 30 covered by the eye-entry element 20 are 42° and 28°, respectively. The range of horizontal and vertical field of view of the displayed image that the human eye 30 can see is a range where both the horizontal and vertical field of view are 16°.
[0036] Optionally, in some embodiments, the eye-viewing element 20 is a reflective optical element capable of reflecting and modulating image light to project onto the retina to form an independent viewpoint 210, and in particular, it can be implemented as a volume holographic optical element or a liquid crystal holographic optical element.
[0037] Specifically, in some embodiments, the retinal projection device further includes an eye-tracking module communicatively connected to the optical engine assembly 10. Thus, when the eye-tracking module detects a rotation of the human eye 30, the optical engine assembly 10 can automatically adjust the light emission of the light-emitting section 11 corresponding to the viewpoint position 21 according to the angle of rotation of the human eye 30, ensuring that the human eye 30 can see the displayed image at the rotated position, simulating the visual mode of the human eye 30, and enhancing the user's immersion and realism.
[0038] In some embodiments, the optomechanical assembly 10 includes a laser light source and a MEMS element. The laser light source is disposed on the incident side of the MEMS element, and the eye-viewing element 20 is disposed on the reflective side of the MEMS element. The laser beam emitted by the laser light source is modulated by the MEMS element to form image light, which is reflected by the MEMS element to the eye-viewing element 20, and finally reflected by the eye-viewing element 20 to form an independent viewpoint 210 projected onto the retina of the human eye 30.
[0039] On the other hand, this application also provides a near-eye display device, which may include a retinal projection device and a device body as described above, with the retinal projection device mounted on the device body. This near-eye display device has a large exit pupil range, capable of covering the range of human eye rotation, ensuring that the human eye can always see the displayed image during rotation, and can also adapt to various interpupillary distances to meet the needs of various user groups.
[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0041] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A retinal projection device, characterized in that, include: An optomechanical assembly, the optomechanical assembly including a plurality of light-emitting zones for emitting image light carrying a partially displayed image; and An eye-viewing element having multiple viewpoint positions, with one light-emitting partition corresponding to one viewpoint position, the eye-viewing element being disposed on the light-emitting side of the optomechanical assembly for reflecting image light output through each of the light-emitting partitions, so as to form multiple independent viewpoints for projection onto the retina at each of the viewpoint positions.
2. The retinal projection device according to claim 1, characterized in that, Multiple viewpoint positions are arranged in an array to form an eye-entry zone corresponding to the pupil of the human eye.
3. The retinal projection device according to claim 2, characterized in that, The distance between two adjacent viewpoints is at most 1 mm.
4. The retinal projection device according to claim 2, characterized in that, The eye-viewing element has 81 viewpoint positions, which are arranged in a 9×9 array.
5. The retinal projection device according to any one of claims 1 to 3, characterized in that, The distance between the viewpoint and the eye-entry element is at most 12mm.
6. The retinal projection device according to claim 2, characterized in that, The horizontal and vertical field of view of the eye-entry element are 42° and 28°, respectively, and the horizontal and vertical field of view of the eye-entry zone are both 16°.
7. The retinal projection device according to any one of claims 1 to 3, characterized in that, The eye-viewing element is a volume holographic optical element or a liquid crystal holographic optical element.
8. The retinal projection device according to any one of claims 1 to 3, characterized in that, The retinal projection device further includes an eye-tracking module that is communicatively connected to the optomechanical assembly.
9. The retinal projection device according to any one of claims 1 to 3, characterized in that, The optomechanical assembly includes a laser light source and a MEMS element. The laser light source is disposed on the incident side of the MEMS element, and the eye-viewing element is disposed on the reflective side of the MEMS element.
10. A near-eye display device, characterized in that, include: The retinal projection device as described in any one of claims 1 to 9; and The main body of the device, wherein the retinal projection device is mounted on the main body of the device.