Pupil Tracking Image Projection for Retinal Alignment
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Solution Overview
Problem
Image projection devices that use the Maxwellian view method struggle to maintain image projection onto the retina when the user moves their eyeballs, leading to a feeling of strangeness due to misalignment of the visual line.
Innovation Solution
An image projection device with a detection unit that tracks the movement of the pupil relative to the face and a control unit that adjusts the projection unit to ensure the image light beam is redirected to maintain alignment with the retina, using a combination of light sources, mirrors, and detection light beams to accurately project the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image projection device uses Maxwellian view to project image onto the retina, then the image can be projected directly onto the retina, but the image alignment becomes incorrect when the user moves their eyeballs
Solution Approach 1:
The system uses a detection unit to detect the direction of pupil movement, and the control unit uses this feedback information to dynamically adjust the projection unit, moving the image in the opposite direction of pupil movement to maintain proper alignment on the retina
Solution Approach 2:
The system transitions from a static projection system to a dynamic one by continuously detecting pupil movement and adjusting the image position in real-time, allowing the projection system to adapt to changing eyeball positions
2Device complexity
If the image position is fixed on the retina, then the projection system is simple, but the visual line alignment becomes incorrect when the pupil moves
Solution Approach 1:
The detection unit continuously monitors pupil position and provides feedback to the control unit, which adjusts the projection unit accordingly to maintain reliable visual line alignment despite pupil movement
Solution Approach 2:
The system automatically detects and corrects its own alignment issues through the detection unit and control unit working together,无需 external intervention to maintain proper image positioning
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 device effectively maintains image projection onto the retina, preventing the feeling of strangeness caused by misalignment, by dynamically adjusting the image light beam path based on pupil movement, ensuring a stable visual experience.
Implementation Method 1
a light source emitting the image light beam
Implementation Method 2
a mirror that is located in front of the eyeball and reflects the image light beam scanned by the scan unit to the pupil
Implementation Method 3
the detection unit may be configured to detect the direction in which the pupil has moved relative to the face of the user based on a detection result of reflected light that is the detection light beam reflected by the eyeball of the user
Data Source
AI summary
An image projection device includes: a projection unit that irradiates a pupil 40 of an eyeball 36 of a user with an image light beam 34a forming an image to project the image onto a retina 38 of the eyeball; a detection unit that detects a direction 52 in which the pupil has moved relative to a face of the user; and a control unit that controls the projection unit based on a detected direction in which the pupil has moved so that the pupil is irradiated with the image light beam and the image is moved in a direction opposite to the direction in which the pupil has moved with respect to a position on which the image has been projected before a move of the pupil in a coordinate system visually recognized by the user.