Head Mounted Display Eyeball Tracking via Reflection Layer
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Solution Overview
Problem
Current head-mounted display devices for virtual and augmented reality suffer from inaccuracies in eyeball tracking due to the angular difference between camera lenses and eyeballs, as cameras are typically exposed and not positioned optimally for frontal imaging.
Innovation Solution
The implementation of a head-mounted display device with a mask featuring a light reflection layer, infrared transmitters, and an image capture device, where the infrared transmitters emit light beams that are reflected onto the eyeballs, allowing the image capture device to capture a frontal image through the mechanism of light reflection, thereby reducing the angle discrepancy and improving tracking accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cameras are disposed around the display in an exposed design, then the device structure is simple and easy to manufacture, but the angle difference between the camera lens and the eyeballs increases, reducing eyeball tracking accuracy
Solution Approach 1:
A light reflection layer is introduced as an intermediary between the infrared transmitter and the eyeballs. The infrared transmitter emits light that reflects off this layer to illuminate the eyeballs from the front, enabling the image capture device to capture frontal eyeball images with high accuracy without requiring the camera to be positioned at an optimal angle
Solution Approach 2:
The solution transitions from direct optical capture to indirect optical capture through light reflection. By adding the light reflection layer, the system captures light that has reflected from the eyeballs rather than directly viewing them, effectively changing the optical path dimension and enabling frontal imaging despite the camera's fixed position around the display
2Measurement precision
If the camera lens is positioned at an angle to capture eyeballs, then the device structure is simplified, but the captured image is not frontal, affecting tracking performance
Solution Approach 1:
The light reflection layer serves as a mediator that redirects light from the infrared transmitter to illuminate the eyeballs frontally. This allows the image capture device to capture frontal eyeball images even though the camera is positioned around the display, resolving the conflict between structural simplicity and imaging quality
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 configuration enhances the accuracy of eyeball tracking by projecting light beams frontally and capturing frontal images, improving the overall performance of the head-mounted display device.
Implementation Method 1
The mask has a first light reflection layer on a first side. The infrared transmitter is disposed in the frame and is used to emit an emitting light beam toward the first light reflection layer. The first light reflection layer reflects the emitting light beam to send a reflective light beam toward a target area.
Data Source
AI summary
A head mounted display device, including a frame, a mask, at least one infrared (IR) transmitter, and at least one image capture device, is provided. The mask has a first light reflection layer on a first side. The IR transmitter is disposed in the frame and is used to emit an emitting light beam toward the first light reflection layer. The first light reflection layer reflects the emitting light beam to send a reflective light beam toward a target area. The image capture device is disposed in the frame and is used to capture a target area reflective image of the target area.