Pupil Position Detection in Retina Scanning Displays
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Solution Overview
Problem
Conventional pupil position detection methods in eyeglass-type retina scanning displays are complex and prone to reduced precision, requiring additional imaging devices and complicated timing control for light beam emission, which complicates the operation and reduces the accuracy of pupil position detection.
Innovation Solution
An image generating device and method that includes a light source, a light scanning mirror, a measurement mechanism for intensity change detection, a sampling mechanism for pupil intensity sampling, and a mechanism for synchronizing the sampled intensity with scanning time to detect pupil size and position, allowing precise projection of an image beam onto the detected pupil position during scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pupil position detection methods are used with additional imaging devices and complicated timing control, then pupil position can be detected, but the system complexity increases and detection precision decreases
Solution Approach 1:
The patent merges the image projection function and pupil detection function into a single integrated optical system. The same light source and scanning mirror used for projecting images onto the retina are also used to detect pupil position by measuring reflected light intensity, eliminating the need for separate imaging devices and reducing system complexity.
Solution Approach 2:
The scanning light beam serves multiple functions: it projects images onto the retina during the outgoing leg of its oscillation and detects pupil position during the returning leg. This multi-functional approach allows the system to use the same hardware components for both image display and pupil tracking, simplifying the overall system architecture.
2Measurement precision
If additional imaging devices are added for pupil detection, then pupil position can be detected, but the device structure becomes more complex
Solution Approach 1:
The patent combines the image projection optical system and pupil detection optical system into one unified system. The light source, scanning mirror, and detection mechanism are shared between both functions, eliminating redundant components and simplifying the device structure while maintaining detection capability.
Solution Approach 2:
The system uses its own scanning light beam to perform both image projection and pupil detection functions. The reflected light from the pupil is detected by the same system that projects the image, allowing the device to serve its own detection needs without external imaging devices.
3Reliability
If complicated timing control is implemented for light beam emission, then image and detection can be coordinated, but the operation becomes more complex
Solution Approach 1:
The patent uses the periodic oscillation of the scanning mirror to coordinate image projection and pupil detection. The light beam naturally oscillates between outgoing and returning legs, with image projection occurring during one phase and detection during the other phase, providing automatic timing coordination without complex control mechanisms.
Solution Approach 2:
The system uses the position and intensity information from the reflected light beam as feedback to determine pupil position. This feedback mechanism allows the system to automatically adjust and coordinate the timing of image projection and detection based on real-time optical feedback, simplifying operational control.
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
Enables easier and more precise detection of the pupil position, ensuring accurate image projection onto the retina without the need for additional imaging devices, thereby simplifying the system and improving image quality.
Implementation Method 1
measuring a change in the intensity of light reflected from an eyeball as time elapses through the scanning of at least a surface of the eyeball with a light beam
Data Source
AI summary
This invention is provided with: a light source; a light scanning mirror; a measurement mechanism for measuring a change in the intensity of light reflected from an eyeball as time elapses through the scanning of at least a surface of the pupil with a light beam by means of the light scanning mirror; a sampling mechanism for sampling the intensity of light reflected from the pupil from the measured change in the intensity of the reflected light as time elapses; and a mechanism for detecting the size and the position of the pupil by synchronizing the sampled intensity of light reflected from the pupil, and the scanning time during which the surface of the eyeball is scanned; and an image generating mechanism for forming an image on the retina of the eyeball by projecting a light beam for generating an image onto the pupil in the detected position while scanning.