CN-122018145-A - Shading structure for eyeball tracking system and eyeball tracking system

Abstract

The application discloses a shading structure for an eyeball tracking system and the eyeball tracking system, wherein the first shading structure is arranged on a light path of a light source irradiated to a first optical display system, so that the light source is prevented from being irradiated to the first optical display system, and first stray light formed by reflecting or scattering light of the light source by the first optical display system is effectively prevented, and further, the first stray light is prevented from entering a first eyeball area. Therefore, excessive stray light spots in the acquired eye images are avoided, the eye images with the effective light spots and higher quality can be obtained, and the precision and the efficiency of eyeball tracking calculation are improved.

Inventors

• Request for anonymity
• Request for anonymity
• Request for anonymity

Assignees

• 北京七鑫易维信息技术有限公司
• 北京七鑫易维科技有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (20)

1. 1. A shading structure for an eyeball tracking system is characterized by comprising a light source and a photomask; The first optical display system comprises a lens group and a display screen which are sequentially arranged along a first direction, wherein the first direction is the sight direction of eyes of a user looking at the first optical display system; the light shield comprises a first shading structure, wherein the first shading structure is used for shading a first light area, and the first light area is provided with the first stray light.
2. 2. The light shielding structure for an eye tracking system according to claim 1, wherein the first light shielding structure shields at least light rays emitted from the light source at a first irradiation angle, the first irradiation angle is an included angle between a tangent T1 and a tangent T2, the tangent T1 is a line with a minimum X-axis angle among all tangent lines from a point on the light source to a surface of the first optical display system, and the tangent T2 is a line with a maximum X-axis angle among all tangent lines from a point on the light source to a surface of the first optical display system.
3. 3. The shade structure for an eye tracking system according to claim 1, wherein the first light zone comprises a sub-light zone one, the light source being located between the lens group and the first eye ball zone, the sub-light zone one characterizing a light zone of the light source impinging on the lens group.
4. 4. The light shielding structure for an eye tracking system according to claim 1, wherein the first light field includes a sub-light field two, the lens group includes at least a first lens group and a second lens group disposed along a first direction, the light source is located between the first lens group and the second lens group, and the sub-light field two characterizes a light field of the light source irradiated onto the second lens group.
5. 5. The shade structure for an eye tracking system according to claim 1, wherein the first light zone comprises a sub-light zone three, the light source being located between the lens group and the display screen, the sub-light zone three characterizing a light zone of the light source impinging on the display screen.
6. 6. The shade structure for an eye tracking system according to claim 1, wherein the mask further comprises a second shade structure; And part of light rays of the light source irradiate on the second eyeball area to form second stray light rays, and the second shading structure is used for shading a second light area, wherein the second stray light rays are arranged in the second light area.
7. 7. The structure of claim 6, wherein the second light shielding structure shields at least light rays emitted from a second angle of illumination, the second angle of illumination being an angle between a tangent T3 and a tangent T4.
8. 8. The shade structure for an eye tracking system according to claim 7, further comprising a first preset center and a second preset center, wherein the first preset center is an intersection of a Z axis passing through a center of the first optical display system and an X axis, and the second preset center is an intersection of the Z axis passing through a center of the second optical display system and the X axis.
9. 9. The light shielding structure for an eye tracking system according to claim 8, wherein the tangent T3 is a line having a smallest angle with respect to the X-axis among all tangents from a point on the light source to the surface of the second eye region, and the tangent T4 is a line having a largest angle with respect to the X-axis among all tangents from a point on the light source to the surface of the second eye region.
10. 10. The light shielding structure for an eye tracking system according to claim 8, wherein the tangent T3 is a line having a smallest angle with respect to the X-axis among all tangents from a point on the light source to the surface of the first eye region, and the tangent T4 is a line having a smallest angle with respect to the X-axis among all tangents from a point on the light source to the surface of the second eye region.
11. 11. The light shielding structure for an eye tracking system according to claim 9, wherein, with a second preset center as an origin, a tangential point coordinate of the tangential line T3 and the second eye region surface is (13,0,8), and a tangential point coordinate of the tangential line T4 and the second eye region surface is (-24,0,42), the second irradiation angle is not less than 27 °.
12. 12. The structure of claim 9, wherein the second irradiation angle is not less than 66 degrees when the tangential line T3 and the second eyeball area surface have a tangential point coordinate (13,0,8) and the tangential line T4 and the second eyeball area surface have a tangential point coordinate (-24,0,42) with the second preset center as the origin.
13. 13. The light shielding structure for an eye tracking system according to claim 9, wherein, with a second preset center as an origin, a tangential point coordinate of the tangential line T3 and the second eye region surface is (0,0,8), and a tangential point coordinate of the tangential line T4 and the second eye region surface is (-6,0,11), the second irradiation angle is not less than 2 °.
14. 14. The light shielding structure for an eye tracking system according to claim 9, wherein, with a second preset center as an origin, a tangential point coordinate of the tangential line T3 and the second eye region surface is (0,0,8), and a tangential point coordinate of the tangential line T4 and the second eye region surface is (-6,0,11), the second irradiation angle is not less than 8 °.
15. 15. The light shielding structure for an eye tracking system according to claim 9, wherein, with a second preset center as an origin, a tangential point coordinate of the tangential line T3 and the second eye region surface is (13,0,8), and a tangential point coordinate of the tangential line T4 and the second eye region surface is (-24,0,21), the second irradiation angle is not less than 13 °.
16. 16. The structure of claim 9, wherein the second irradiation angle is not less than 54 degrees when the tangential line T3 and the second eyeball area surface have a tangential point coordinate (13,0,8) with a second predetermined center as an origin and the tangential line T4 and the second eyeball area surface have a tangential point coordinate (-24,0,21).
17. 17. The structure of claim 10, wherein the tangent T4 is at least 6 degrees with a first predetermined center as an origin, a point of contact of the tangent T4 with the surface of the first eyeball area is at least 13,0,8, and a point of contact of the tangent T3 with the surface of the second eyeball area is at least 13,0,8.
18. 18. The shade structure for an eye tracking system according to claim 1, wherein the mask further comprises a third shade structure; And part of light rays of the light source irradiate on a second optical display system, the second optical display system can form third stray light rays, and the third shading structure is used for shading a third light region, wherein the third stray light rays are arranged in the third light region.
19. 19. The structure of claim 18, wherein the third light shielding structure shields at least light rays emitted from a third irradiation angle, the third irradiation angle being an angle between a tangent T5 and a tangent T6, the tangent T5 being a line having a smallest angle between a point on the light source and an X-axis among all tangents formed from the surface of the second optical display system, and the tangent T6 being a line having a largest angle between the point on the light source and the X-axis among all tangents formed from the surface of the second optical display system.
20. 20. The shade structure for an eye tracking system according to claim 1, wherein the mask further comprises a light transmissive structure; The light-transmitting structure can transmit infrared light and is used for forming a light-transmitting area, wherein the light-transmitting area is a light irradiation area of the light source for forming light supplement.

Description

Shading structure for eyeball tracking system and eyeball tracking system Technical Field The present application relates to the field of eye tracking technology, and in particular, to a shading structure for an eye tracking system and an eye tracking system. Background With the study and understanding of near-eye display technology, near-eye display products are applied to various industries. Among them, VR (Virtual Reality) technology and (Augmented Reality ) technology are widely used. An eye tracking device with an eye tracking function is generally configured in the current VR device, a pupil cornea reflection method is generally adopted by the eye tracking device, a user eye is irradiated through an infrared light source, an image sensor can acquire an eye image of the user with light spots, and eye tracking calculation is performed through the eye image of the user with light spots. Accordingly, in VR devices, a light source for illuminating the eyes of a user is typically disposed near a lens within the VR device when the eye tracking device is configured, facilitating illumination of the eyes of the user by the light source. When tracking the gazing position of an eyeball, light spots in an eye image are formed by cornea reflection light rays in the eyeball, but due to the compact structural design of the near-eye display device, partial light rays generated by a light source are very easy to generate irregular light paths in the VR device, and partial light rays are reflected or scattered by other surfaces and finally enter the shooting view field of a camera to form stray light spots in the image, so that the shooting quality of the eye image is poor, and adverse effects are caused on the tracking calculation of the eyeball. Disclosure of Invention The application provides a shading structure for an eyeball tracking system and the eyeball tracking system, which are used for solving the problem that part of light generated by a light source in the related art enters stray light in the field of view of a camera, improving the quality of an eye image for eyeball tracking calculation and improving the precision of eyeball tracking. According to an aspect of the present application, there is provided a light shielding structure for an eye tracking system, including a light source and a mask; The first optical display system comprises a lens group and a display screen which are sequentially arranged along a first direction, wherein the first direction is the direction of the sight line of the eyeball of a user, which is focused on the first optical display system; the light shield comprises a first shading structure, wherein the first shading structure is used for shading a first light area, and the first light area is provided with the first stray light. Optionally, the first light shielding structure at least shields the light emitted from the light source at a first irradiation angle, the first irradiation angle is an included angle between a tangent line T1 and a tangent line T2, the tangent line T1 is a line with the smallest angle between a point on the light source and an X-axis among all tangent lines made from the surface of the first optical display system, and the tangent line T2 is a line with the largest angle between the point on the light source and the X-axis among all tangent lines made from the surface of the first optical display system. Optionally, the first optical zone includes a first sub-optical zone, the light source is located between the lens group and the first sphere area, and the first sub-optical zone characterizes an optical zone of the light source irradiated onto the lens group. Optionally, the first optical zone includes a second sub optical zone, the lens group includes at least a first lens group and a second lens group disposed along a first direction, the light source is located between the first lens group and the second lens group, and the second sub optical zone characterizes an optical zone irradiated onto the second lens group by the light source. Optionally, the first light region includes a third sub-light region, the light source is located between the lens group and the display screen, and the third sub-light region characterizes the light region irradiated onto the display screen by the light source. Optionally, the light shielding structure for the eye tracking system, the light shield further comprises a second light shielding structure; and part of light rays of the light source irradiate on the second eyeball area to form second stray light rays, and the second shading structure is used for shading a second light area, wherein the second light area is provided with the second stray light rays. Optionally, the second light shielding structure at least shields the light emitted from the second irradiation angle, where the second irradiation angle is an included angle between the tangent T3 and the tangent T4. Optionally, the optical display system furt