Eye Tracking Module Alignment for Head-Mounted Displays
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Solution Overview
Problem
Existing head-mounted display devices with eye-tracking functions face issues due to assembly errors, such as offset and rotation of cameras relative to the lenses, which hinder proper eye tracking functionality.
Innovation Solution
The design includes an eye tracking module with an outer frame, first and second cameras, and lens frames that are movably arranged and magnetically attracted to ensure precise positioning on the body of the head-mounted display device, eliminating offset and rotation, and allowing for adjustable interpupillary distance and eye relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cameras are fixed to lenses on the head-mounted display device, then eye tracking function can be provided, but assembly errors cause offset and rotation in two axes perpendicular to the line of sight and offset in the direction of the line of sight
Solution Approach 1:
The device is divided into separate functional modules: the head-mounted display device with lenses and positioning portions, and the eye tracking module with cameras and corresponding positioning portions. This segmentation allows independent assembly and positioning of each module, reducing cumulative assembly errors and improving overall alignment precision.
Solution Approach 2:
The positioning portions on both the head-mounted display device and eye tracking module are designed to automatically align and connect when brought together. The complementary positioning structures enable self-positioning and self-alignment of cameras relative to lenses without requiring complex external alignment tools or procedures.
2Adaptability or versatility
If cameras are fixed to lenses, then eye tracking function is enabled, but assembly errors affect the normal performance of the eye tracking function
Solution Approach 1:
The positioning portions are designed with universal compatibility between the head-mounted display device and eye tracking module. The standardized positioning interface ensures that the eye tracking module can be reliably assembled on the head-mounted display device, enabling consistent and reliable eye tracking performance across different assembly instances.
3Adaptability or versatility
If two independent cameras are provided for eye tracking, then eye tracking function can be extended, but assembly errors in one camera-lens pair may occur even if another is assembled correctly
Solution Approach 1:
Both cameras are integrated into a single eye tracking module that is assembled as one unit on the head-mounted display device. The positioning portions ensure that both cameras are positioned relative to their corresponding lenses simultaneously when the module is connected, reducing assembly complexity and ensuring consistent alignment for both eye tracking channels.
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
This solution ensures accurate and reliable eye tracking by eliminating assembly errors, providing a user-friendly and cost-effective method for aligning cameras with lenses, and allowing for customizable fit to enhance user experience.
Implementation Method 1
lens frames that are movably arranged and magnetically attracted to ensure precise positioning on the body
Data Source
AI summary
A head-mounted display device includes a body, an eye tracking module and a face gasket. The body has a first lens and a second lens corresponding to both eyes, and also has a first positioning portion. The eye tracking module is assembled to and electrically connected to the body and includes an outer frame, a first camera, a second camera, a first lens frame and a second lens frame. The outer frame has a second positioning portion. The second positioning portion is used for connecting with the first positioning portion, so that the outer frame is positioned on the body. The first lens frame and the second lens frame are movably arranged on the outer frame. The first lens frame is used for connecting the first lens. The second lens frame is used for connecting the second lens. The first camera is arranged on the first lens frame. The second camera is arranged on the second lens frame. The first camera and the second camera are used to shoot both eyes.