VR Headset Partial-Reflection Lens for Eye Tracking
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Solution Overview
Problem
Existing VR head-mounted apparatuses face difficulties in accurately acquiring infrared images of a user's eye due to structural constraints, which hinders biometric recognition and eye tracking tasks.
Innovation Solution
A VR head-mounted apparatus is designed with a convex lens and a partial-reflection partial-transmission lens, which reflects infrared light to a camera without interfering with the user's view, reducing distortion and improving image acquisition accuracy. The apparatus includes an infrared light source for compensation and a camera interface connected to an electronic device for image transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional camera is used to acquire infrared images of the user's eye in a VR head-mounted apparatus, then the apparatus structure is simple, but the image acquisition accuracy is poor due to structural constraints
Solution Approach 1:
An infrared-transparent window is introduced as an intermediary component between the user's eye and the camera. This window allows infrared light to pass through while maintaining the compact VR head-mounted structure, enabling accurate infrared image acquisition without requiring complex structural modifications
Solution Approach 2:
The camera is positioned at a specific distance from the user's eye (e.g., 5-10mm) to optimize the field of view and image quality. By adjusting the camera's position and the window's thickness, the system achieves accurate infrared image capture within the constrained VR apparatus structure
2Measurement precision
If the camera is positioned to directly face the user's eye, then the image acquisition is straightforward, but it interferes with the user's view of the VR display content
Solution Approach 1:
The infrared-transparent window is designed with specific optical properties - it is transparent to infrared light but opaque or reflective to visible light. This allows the camera to capture infrared images through the window while preventing the camera structure from interfering with the user's view of the VR display content
Solution Approach 2:
The camera is positioned laterally (to the side) rather than directly in front of the user's eye. By changing the spatial dimension of camera placement, the system can acquire eye images without blocking the user's forward view of the VR display, resolving the conflict between measurement accuracy and visual interference
3Reliability
If the infrared light source is placed close to the first convex lens for compensation, then the infrared compensation efficiency is high, but the risk of infrared light affecting the VR display content is increased
Solution Approach 1:
The infrared-transparent window serves as a mediator that directs infrared light from the compensation source to the user's eye while blocking infrared light from reaching the VR display content. This allows effective infrared compensation without the harmful side effect of infrared interference with the display
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables quick and accurate acquisition of infrared images, enhancing eye tracking and iris recognition precision while minimizing interference with the user's VR experience.
Implementation Method 1
The partial-reflection partial-transmission lens may be positioned and configured to reflect infrared light from the user's eye to the camera
Implementation Method 2
the partial-reflection partial-transmission lens may comprise an infrared dichroic mirror
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for a virtual reality (VR) head-mounted apparatus are provided. One of the apparatus includes: a first convex lens on a side of the apparatus close to a user's eye when the user wears the apparatus, a partial-reflection partial-transmission lens located in the apparatus and on a side of the first convex lens away from the user's eye; and a camera located between the first convex lens and the partial-reflection partial-transmission lens. The partial-reflection partial-transmission lens is positioned and configured to reflect infrared light from the user's eye to the camera. The VR head-mounted apparatus improves the acquisition accuracy of an infrared image of an eye of the user wearing the apparatus.