Eye Tracking Optical System Using Polarization Separation
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Solution Overview
Problem
Existing augmented reality (AR) and virtual reality (VR) systems face challenges in accurately tracking the user's eye gaze point, which affects the stereoscopic display and overall user experience.
Innovation Solution
An eye tracking optical system is developed, comprising a display panel module that emits a first polarized light and an eye tracking module with a light reflection unit and a light reception unit. The light reflection unit reflects a second polarized light from the eye and couples it to the light reception unit for eye tracking, without affecting the original light emitted to the user's eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light reflection unit is added to receive reflected light from the human eye, then eye tracking capability is improved, but the optical system complexity increases
Solution Approach 1:
The patent combines the display function and eye tracking function into a single integrated optical system. The display panel module serves both to emit display light to the user's eye and to work with the light reflection unit for receiving reflected eye light, eliminating the need for separate tracking hardware and reducing overall system complexity.
Solution Approach 2:
The display panel module is designed to serve multiple functions: it acts as both the light source for display and as part of the optical path for eye tracking. The same optical components serve dual purposes, making the system more efficient and less complex while maintaining accurate eye tracking capability.
2Measurement precision
If polarization filtering is used to separate first light and second light, then light separation efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent utilizes the polarization parameter of light to differentiate and separate the first light (display light) and second light (reflected eye light). By assigning different polarization states to different light paths and using corresponding polarization filters, the system achieves efficient light separation through parameter differentiation rather than complex physical separation mechanisms.
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 system effectively tracks the user's eye gaze point, enhancing the user experience by improving the accuracy of stereoscopic displays in AR and VR applications without compromising the normal display requirements.
Implementation Method 1
the first light is a first polarized light, the second light is a second polarized light, and a polarization direction of the first polarized light and a polarization direction of the second polarized light are perpendicular; the light reflection unit includes a first reflection interface, the first reflection interface includes a plurality layers of dielectric films, and the first reflection interface is configured to reflect the second polarized light and transmit the first polarized light
Implementation Method 2
the light reflection unit is configured to receive a second light reflected by the human eye
Implementation Method 3
the second reflection interface includes a dichroic optical coating, and the second reflection interface is configured to reflect the infrared light and transmit a visible light
Data Source
AI summary
The disclosure provides an eye tracking optical system and a display device, and the eye tracking optical system includes a display panel module, configured to emit a first light to a human eye; an eye tracking module, provided on a light emitting side of the display panel module, including a light reflection unit and a light reception unit, where the light reflection unit is configured to receive a second light reflected by the human eye and couple the second light to the light reception unit, the light reception unit is configured to receive the incident second light to perform eye tracking, and the first light and the second light are different lights.