Head-Mounted Display Frame Bending Compensation
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Solution Overview
Problem
Head-mounted display devices with laser-based image projection systems face image shift issues due to frame deformation, which affects the accuracy of image display when worn on the head.
Innovation Solution
Incorporating a detection section to monitor light reflections or transmissions from a deflection section, allowing for real-time adjustments in light emission timing to compensate for frame bending, thereby maintaining image stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the scan section and deflection section are arranged in the temple section and front section respectively, then the device can be mounted on the head, but the relative locations deviate from proper locations due to frame deformation, causing image shift
Solution Approach 1:
The detection section detects the actual relative location between scan section and deflection section after frame deformation occurs. This feedback information is used to adjust the timing of light emission from the light source, compensating for the location deviation and maintaining image accuracy despite frame bending.
Solution Approach 2:
The system changes the timing parameter of light emission based on the detected relative location deviation. By adjusting when light is emitted relative to the scan and deflection operations, the system compensates for frame deformation and maintains proper image alignment.
2Manufacturing precision
If a detection section is added to detect frame bending, then image shift can be suppressed, but device complexity increases
Solution Approach 1:
The detection section detects light from the deflection section using the same optical path and components already present in the device (light source, scan section, deflection section). This allows the detection function to be integrated without adding separate dedicated detection hardware, reducing the increase in device complexity.
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 solution effectively suppresses image shift caused by frame bending, ensuring clear and accurate image display by dynamically adjusting the light emission based on detected frame deformation.
Implementation Method 1
a scan section that is arranged in the temple section, and is configured to scan light which is emitted from a light source
Implementation Method 2
a deflection section that is arranged in the front section, and is configured to deflect light, which is scanned by the scan section, of the light which is emitted from the light source toward the eyes of the observer
Implementation Method 3
a detection section that detects light, which is reflected in the deflection section, of the light which is scanned by the scan section
Data Source
AI summary
An image display device is used by being mounted on an observer, and includes: a frame section that includes a front section and a temple section; a modulated light generation section, a scan section that is arranged in the temple section and scans the modulated light which is emitted from the modulated light generation section; a deflection section that is arranged in the front section and deflects the modulated light which is scanned by the scan section toward the eye of the observer; and a detection section that detects the modulated light which is reflected in the deflection section.