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CN-122018144-A - Light source module for eye tracking and eye tracking system

CN122018144ACN 122018144 ACN122018144 ACN 122018144ACN-122018144-A

Abstract

The application discloses a light source module and an eyeball tracking system for eyeball tracking, which are characterized in that a light shield is arranged on a light path of a light source irradiating to a same-side optical display system, and a light transmission area is arranged on the light shield, so that the light of the light source irradiates to a same-side eyeball area through the light transmission area, when the light transmission area is the same-side eyeball area, the light of the light source just can completely illuminate the same-side eyeball area, and as the light of the light source cannot be reflected or scattered by the surfaces of other equipment, no other stray light enters the same-side eyeball area, so that excessive stray light spots in the acquired eye images are avoided, the eye images with the effective light spots with 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 light source module for eye tracking, comprising: the light source irradiates part of light rays of the light source on the same side eyeball area and is used for supplementing light; The light shield comprises a light transmission element and a shading element, wherein the light transmission element is used for enabling light rays of the light source to irradiate towards a light transmission area, the shading element is used for blocking the light rays to irradiate towards the shading area, and the light transmission range of the light transmission area at least comprises an on-side eyeball area, wherein the on-side eyeball area is characterized by being an area surrounded by curved surfaces formed by all tangent lines from any point on the light source to the outermost side surface of the on-side eyeball area.
  2. 2. The light source module for eye tracking according to claim 1, wherein the light transmitting element irradiates light emitted from a light transmitting angle of the light source to the same-side eyeball area, the light transmitting angle is an included angle between a tangent Ta and a tangent Tb, the tangent Ta is a line with the smallest X-axis included angle among all tangent lines from a point on the light source to the same-side eyeball area surface, and the tangent Tb is a line with the largest X-axis included angle among all tangent lines from a point on the light source to the same-side eyeball area surface.
  3. 3. The light source module for eye tracking according to claim 2, further comprising a first preset center and a second preset center, wherein the first preset center is an intersection point of a Z axis passing through a center of the same-side optical display system and an X axis, and the second preset center is an intersection point of a Z axis passing through a center of the different-side optical display system and an X axis.
  4. 4. A light source module as recited in claim 3, wherein the light transmission angle is not less than 10 ° when the tangential line Ta and the same lateral sphere area surface have a tangential point coordinate (0,0,8) and the tangential line Tb and the same lateral sphere area surface have a tangential point coordinate (6,0,11) with respect to a first predetermined center as an origin.
  5. 5. A light source module as recited in claim 3, wherein the light transmission angle is not less than 64 ° when the tangential line Ta and the surface of the ipsilateral sphere have a tangential point coordinate (-13,0,8) and the tangential line Tb and the surface of the ipsilateral sphere have a tangential point coordinate (24,0,21) with a first predetermined center as an origin.
  6. 6. A light source module as recited in claim 3, wherein the light transmission angle is not less than 70 ° when the tangential line Ta and the surface of the ipsilateral sphere have a tangential point coordinate (-13,0,8) and the tangential line Tb and the surface of the ipsilateral sphere have a tangential point coordinate (24,0,42) with respect to a first predetermined center as an origin.
  7. 7. The light source module for eye tracking according to claim 1, wherein the light-transmitting element is a notch or a light-transmitting member.
  8. 8. The light source module for eye tracking according to claim 1, wherein the light transmission range of the light transmission region is at most the difference between the light divergence region and the light shielding region of the light source.
  9. 9. The light source module for eye tracking according to claim 8, wherein the light shielding region is at least a light region where the light source forms stray light.
  10. 10. The light source module for eye tracking according to claim 8, wherein the light shielding element shields at least the light emitted from the light shielding angle by the light source, so that the light emitted from the light source in the light shielding angle cannot strike the light shielding area, and the light transmitting area does not include the light emitted from the light shielding angle by the light source.
  11. 11. The light source module for eye tracking according to claim 10, wherein the light shielding region comprises a first light shielding element, the light shielding element comprises a first light shielding element, the first light shielding element is used for shielding the first light region, the first light region characterizes the light region irradiated by the light source onto a simultaneous optical display system, the simultaneous optical display system comprises a lens group and a display screen which are sequentially arranged along a first direction, and the first direction is a viewing direction of the eye of the user looking at the simultaneous optical display system.
  12. 12. The light source module for eye tracking according to claim 11, wherein the light shielding angle comprises a first light shielding angle, the first light shielding element shields at least light rays emitted from the light source at the first light shielding angle, the first light shielding angle is an included angle between a tangent T1 and a tangent T2, the tangent T1 is a line with the smallest X-axis included angle among all tangent lines from any point on the light source to the surface of the same-side optical display system, and the tangent T2 is a line with the smallest Z-axis included angle among all tangent lines from any point on the light source to the surface of the same-side optical display system. The first shading angle is not smaller than 80 degrees.
  13. 13. The light source module for eye tracking according to claim 10, wherein the light shielding region comprises a second light region, the light shielding element comprises a second light shielding element for shielding the second light region, the second light region characterizing the light source illuminating the lateral-most area.
  14. 14. The light source module for eye tracking according to claim 13, wherein the shading angle comprises a second shading angle, the second shading element at least shades the light emitted from the second shading angle, and the second shading angle is an included angle between a tangent T3 and a tangent T4.
  15. 15. The light source module for eye tracking according to claim 14, wherein the tangent T3 is a line having a smallest angle between the tangent and the X-axis among all the tangents from a point on the light source to the surface of the lateral-sphere region, and the tangent T4 is a line having a largest angle between the tangent and the X-axis among all the tangents from a point on the light source to the surface of the lateral-sphere region.
  16. 16. The light source module for eye tracking according to claim 14, 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 ipsilateral sphere 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 ipsilateral sphere region.
  17. 17. The light source module for eye tracking according to claim 15, wherein the second light shielding angle is not less than 27 degrees when the tangential line T3 and the lateral-sphere area surface have a tangential point coordinate of (13,0,8) and the tangential line T4 and the lateral-sphere area surface have a tangential point coordinate of (-24,0,42) with respect to a second predetermined center as an origin.
  18. 18. The light source module for eye tracking according to claim 15, wherein the second light shielding angle is not smaller than 66 degrees when the tangential line T3 and the lateral-sphere area surface have a tangential point coordinate of (13,0,8) and the tangential line T4 and the lateral-sphere area surface have a tangential point coordinate of (-24,0,42) with the second predetermined center as an origin.
  19. 19. The light source module for eye tracking according to claim 15, wherein the second light shielding angle is not less than 2 degrees when the tangential line T3 and the lateral-sphere area surface have a tangential point coordinate of (0,0,8) and the tangential line T4 and the lateral-sphere area surface have a tangential point coordinate of (-6,0,11) with respect to a second predetermined center as an origin.
  20. 20. The light source module for eye tracking according to claim 15, wherein the second light shielding angle is not less than 8 degrees when the tangential line T3 and the lateral-sphere area surface have a tangential point coordinate of (0,0,8) and the tangential line T4 and the lateral-sphere area surface have a tangential point coordinate of (-6,0,11) with respect to a second predetermined center as an origin.

Description

Light source module for eye tracking and eye tracking system Technical Field The present application relates to the field of eye tracking, and in particular, to a light source module for eye tracking 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, so that the image acquisition device (such as a camera) cannot acquire high-quality eye images with the light spots, and adverse effects are caused on the tracking calculation of the eyeball. Disclosure of Invention The application provides a light source module for eye tracking and an eye 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 eye images for eye tracking calculation and improving the precision of eye tracking. According to an aspect of the present application, there is provided a light source module for eye tracking, including a light source and a mask; part of light rays of the light source irradiate on the same-side eyeball area and are used for supplementing light; The photomask comprises a light-transmitting element and a shading element, wherein the light-transmitting element is used for forming a light-transmitting area and adjusting a light irradiation area of the light source, the shading element is used for forming a shading area to block light from transmitting, the light-transmitting range of the light-transmitting area at least comprises an on-side eyeball area, and the on-side eyeball area is characterized by being an area surrounded by curved surfaces formed by all tangent lines from any point on the light source to the outermost surface of the on-side eyeball area. Optionally, the light transmitting element makes the light emitted from the light transmitting angle irradiate towards the same-side eyeball area, the light transmitting angle is an included angle between a tangent line Ta and a tangent line Tb, the tangent line Ta is a straight line with the smallest X-axis included angle among all tangent lines from one point on the light source to the surface of the same-side eyeball area, and the tangent line Tb is a straight line with the largest X-axis included angle among all tangent lines from one point on the light source to the surface of the same-side eyeball area. Optionally, the system further comprises a first preset center and a second preset center, wherein the first preset center is an intersection point of a Z axis passing through the center of the same-side optical display system and an X axis, and the second preset center is an intersection point of a Z axis passing through the center of the different-side optical display system and an X axis. Optionally, with the first preset center as an origin, a coordinate of a tangential point between the tangential line Ta and the surface of the ipsilateral eyeball area is (0,0,8), and when a coordinate of a tangential point between the tangential line Tb and the surface of the ipsilateral eyeball area is (6,0,11), the light transmission angle is not less than 10 degrees. Optionally, with the first preset center as an origin, a coordinate of a tangential point between the tangential line Ta and the surface of the ipsilateral eyeball area is (-13,0,8), and when a coordinate of a tangential point between the tangential line Tb and the surface of the ipsilateral eyeball area is (24,0,21), the light transmission angle is not less than 64 degrees. Optionally, with the first preset center as an origin, a coordinate of a tangential point between the tangential line Ta and the surface of the ipsilateral eyeball area is (-13,0,8), and when a coordinate of a tangential point between the tangential line Tb and the surface of the ipsilateral eyeball area is (24,0,42), the light