Head-Mounted Display Wavefront Correction for Visual Axis Misalignment
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Solution Overview
Problem
Current head-mounted displays suffer from obvious asymmetric aberrations due to the non-coincidence of the visual axis of the human eye and the optical axis of the optical system, leading to reduced imaging quality and user experience.
Innovation Solution
An imaging method for head-mounted displays that involves detecting the beam wavefront, acquiring the visual axis position of the human eye, calculating the deviation between the visual axis and the optical axis, and adjusting the wavefront incident to the eye to align it with the optical axis, using a wavefront detector and corrector, and a processor to control the liquid crystal spatial light modulator for correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the optical system is designed without considering the difference between visual axis and optical axis, then the device complexity is reduced, but asymmetric aberrations increase and imaging quality deteriorates
Solution Approach 1:
The patent performs preliminary wavefront detection and visual axis measurement before final image presentation. The system pre-calculates the deviation between visual axis and optical axis, and pre-adjusts the wavefront correction in advance to compensate for asymmetric aberrations, rather than attempting to mechanically realign the optical axis with the visual axis during operation.
Solution Approach 2:
The patent changes the wavefront parameters dynamically based on the detected visual axis position. By adjusting the wavefront correction parameters according to the calculated deviation angle, the system compensates for asymmetric aberrations without physically moving or reconfiguring the optical system, thus maintaining device simplicity while improving imaging quality.
2Measurement precision
If conventional fundus micro-imaging technology with multiple lenses is used for aberration detection, then measurement precision is improved, but device complexity increases and miniaturization becomes difficult
Solution Approach 1:
The patent extracts only the essential wavefront detection function from the complex conventional fundus micro-imaging system. By using a simplified wavefront detector that directly measures wavefront aberrations without requiring multiple detection beams and lenses, the system achieves adequate measurement precision while dramatically reducing structural complexity and enabling miniaturization.
Solution Approach 2:
The patent replaces the mechanical multi-lens detection system with a wavefront-based optical measurement approach. Instead of using seven lenses and multiple beam paths for detection, the system uses wavefront detection technology that can achieve aberration measurement with a simpler optical configuration, substituting mechanical complexity with optical field-based measurement.
3Ease of operation
If pupil calibration is performed to make optical axis consistent with beam direction, then device operation is simplified, but imaging quality deteriorates because pupil optical axis does not coincide with visual axis
Solution Approach 1:
The patent introduces a feedback mechanism where the wavefront detector continuously monitors the actual wavefront aberrations, the system calculates the deviation between visual axis and optical axis based on this feedback, and then adjusts the wavefront correction accordingly. This closed-loop feedback ensures that the correction is accurately targeted to the visual axis rather than relying on preliminary pupil calibration that may be inaccurate.
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 method significantly improves imaging quality by aligning the wavefront incident to the eye with the visual axis, reducing asymmetric aberrations and enhancing user experience.
Implementation Method 1
adjusting a wavefront incident to the human eye according to the deviation, so that a correspondence between the wavefront incident to the human eye and the visual axis is consistent with a correspondence between the beam wavefront emitted from the optical system and the optical axis
Implementation Method 2
detecting a beam wavefront emitted by the head-mounted display through its optical system; acquiring a position of a visual axis of a human eye; calculating a deviation between the visual axis of the human eye and an optical axis of the optical system; and adjusting a wavefront incident to the human eye according to the deviation
Data Source
AI summary
An imaging method of a head-mounted display and a head-mounted display are disclosed. The method includes, but is not limited to: detecting a wavefront of a beam emitted by the head-mounted display through its optical system; acquiring a position of a visual axis of a human eye; calculating a deviation between the visual axis of the human eye and an optical axis of the optical system; and adjusting a wavefront incident to the human eye according to the deviation, so that a correspondence between the wavefront incident to the human eye and the visual axis is consistent with a correspondence between the wavefront of the beam emitted from the optical system and the optical axis.