Visual Line Detection Optical Path Alignment
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Solution Overview
Problem
Existing visual line detection technologies face precision issues due to the significant difference between the optical paths of light from a display surface to a user's eyeball and the reflected light from the eyeball to a detector, which affects the accuracy of visual line detection on display surfaces.
Innovation Solution
A visual line detection device and method where light from a display surface passes through optical members and is incident on a user's eyeball, with the reflected light also passing through the same optical members to the imaging unit, ensuring similar influences on both paths and improving detection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different optical paths are used for light from display surface to eyeball and reflected light from eyeball to detector, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges the optical path for displaying light to the eyeball with the optical path for detecting reflected light from the eyeball. The same optical members (lenses, prisms) are used in both paths, allowing the system to achieve high measurement precision while maintaining reasonable device complexity through path integration rather than complete separation.
2Measurement precision
If the same optical members are used for both light paths, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes optical members serve multiple functions: they both guide light from the display surface to the user's eyeball and guide reflected light from the eyeball to the imaging unit. This multi-functionality reduces the need for separate optical components for each path, thereby improving precision without proportionally increasing device complexity.
3Ease of operation
If optical members are installed in the optical path, then light guidance and detection are improved, but detection precision deteriorates due to path differences
Solution Approach 1:
By combining the display light path and detection light path through the same optical members, the patent ensures that any distortions, refractions, or optical effects introduced by these members affect both paths consistently. This consistency allows for accurate visual line detection despite the presence of multiple optical components.
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 precision of visual line detection by aligning the optical paths, allowing for more accurate alignment of the visual line on the display surface with the user's gaze, thereby improving the overall detection process.
Implementation Method 1
Light from the display surface passes through optical members and is incident on a user's eyeball, with the reflected light also passing through the same optical members to the imaging unit
Implementation Method 2
detecting reflected light of the light from the eyeball
Data Source
AI summary
There is provided a visual line detection device including at least one light source configured to radiate light to an eyeball of a user observing a display surface through at least one optical member, and an imaging unit configured to acquire a captured image of the eyeball used to detect a visual line of the user on the display surface by detecting reflected light of the light from the eyeball. The reflected right from the eyeball passes through at least the optical member installed in an optical path along which the light from the display surface travels from the display surface to the eyeball of the user, and is incident on the imaging unit.