Adjustable Beam Splitter for HMD Pupil Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional head-mounted displays (HMDs) are inconvenient to use due to a fixed beam splitter location, requiring users to adjust their viewing direction, which can cause eye fatigue.
Innovation Solution
An HMD system with a beam splitter, pico projector, application processor, eye image sensor, and adjustment apparatus, where the application specific integrated circuit (ASIC) performs perspective correction and adjusts the beam splitter to match the pupil location, allowing dynamic adjustment of the beam to align with the pupil without requiring user-directed viewing adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the beam splitter location is fixed in conventional HMD, then the device structure is simple, but the user must adjust viewing direction which causes eye fatigue and reduces ease of operation
Solution Approach 1:
The beam splitter is transformed from a fixed component to a dynamically adjustable one. The adjustment apparatus enables the beam splitter to move and change its position according to the pupil location detected by the eye image sensor, allowing the system to adapt to different user viewing positions and eliminate the need for users to adjust their viewing direction.
Solution Approach 2:
The HMD system performs self-adjustment by automatically detecting the pupil location through the eye image sensor and controlling the beam splitter position via the adjustment apparatus. This self-service mechanism eliminates the need for manual user adjustment of viewing direction, thereby reducing eye fatigue while managing device complexity through automated control.
2Adaptability or versatility
If the beam splitter is made adjustable to align with pupil location, then user convenience is improved and eye fatigue is reduced, but the device complexity increases due to additional adjustment apparatus
Solution Approach 1:
The system implements a feedback loop where the eye image sensor continuously detects the pupil location, and this information is fed back to the control unit which adjusts the beam splitter position accordingly. This closed-loop feedback mechanism enables the system to adapt to varying pupil positions automatically, improving adaptability while managing complexity through intelligent control rather than mechanical complexity.
Solution Approach 2:
The adjustment apparatus serves multiple functions: it positions the beam splitter for optimal alignment, enables adaptability to different users and viewing conditions, and works in conjunction with the eye image sensor and control unit to create a comprehensive adaptive system. This multi-functionality justifies the added complexity by providing significant improvements in adaptability and user experience.
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 solution enhances user convenience by allowing the HMD to automatically adjust the beam splitter to align with the pupil location, reducing eye fatigue and improving the operation of the device.
Implementation Method 1
the HMD projects the image outputted from respective tube or LCD display on the user's retinas by using a beam splitter
Data Source
AI summary
A head mounted display (HMD) and an imaging method thereof are provided. The HMD comprises a beam splitter, a pico projector, an application processor, an eye image sensor, an adjustment apparatus, an application specific integrated circuit (ASIC), and an eyeglass frame. The application processor controls the pico projector to project a beam. The eye image sensor captures an eye image. The ASIC performs a perspective correction on the eye image to generate a frontal eye image. The ASIC obtains a beam location of the beam and obtains a pupil location according to the frontal eye image. The ASIC according to the beam location and the pupil location controls the adjustment apparatus to adjust the beam splitter. The eyeglass frame carries the beam splitter, the pico projector, the application processor, the eye image sensor and the ASIC.