External HMD Display Parallax Correction for Eye Alignment
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Solution Overview
Problem
Existing systems fail to adjust the display of a three-dimensional (3D) representation on an external facing device to account for observer-based vertical viewing angles, leading to misalignment of the user's eye region relative to the observer.
Innovation Solution
Implementing a software-based vertical parallax correction that adjusts the 3D representation on an external facing display based on observer-based viewing characteristics, using sensors to determine vertical viewing angles and applying adjustments such as offsets and dimming to align the user's eye region accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a 3D representation is displayed on an external facing display without adjustment, then the display is simple and straightforward, but the user's eye region appears misaligned (too high or too low) relative to the observer
Solution Approach 1:
The patent applies vertical parallax correction by adjusting the vertical position parameter of the 3D representation based on the observer's viewing angle. The system calculates a correction offset and applies it to shift the rendered eye region vertically, transforming the display from a fixed alignment to a dynamically adjusted alignment that compensates for different observer positions.
2Measurement precision
If the display is adjusted to account for vertical viewing angles, then the eye region alignment improves, but the device complexity increases due to additional sensors and processing
Solution Approach 1:
The patent leverages the existing external facing cameras on the HMD, which are already present for other functions such as capturing environmental data or user interactions. By repurposing these existing sensors to also determine observer vertical viewing angles, the system avoids adding dedicated hardware and instead uses multi-functional existing components to achieve parallax correction.
3Adaptability or versatility
If multiple observers with different vertical viewing angles are accommodated, then the viewing experience improves for each observer, but the processing complexity increases due to multiple adjustments
Solution Approach 1:
The patent implements different vertical parallax corrections for different horizontal viewing angles. The system determines which observer sector is active and applies a specific vertical adjustment tailored to that sector's characteristics. This localized approach allows each observer region to have optimized alignment without requiring complex real-time adjustments for all possible observer positions simultaneously.
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 ensures that the user's eye region appears correctly positioned relative to the observer, providing a more realistic and aligned 3D representation, enhancing the overall viewing experience.
Implementation Method 1
Cylindrical lenticular lenses may only provide a 3D effect on one axis
Implementation Method 2
the parallax effect may help supplement the 3D effect on the other axis
Data Source
AI summary
Various implementations implement a process for rendering a view of a three-dimensional (3D) representation on an external facing display of a head mounted device (HMD) based on determining observer-based viewing characteristics. For example, a method may include obtaining a 3D representation of at least a portion of a head of a user (e.g., face or eye region), as the user is wearing the HMD in a physical environment. The method may further include determining an observer-based viewing characteristic (e.g., vertical viewing angle or the like) corresponding to one or more vertical viewing angles of one or more observers relative to the HMD in the physical environment, the one or more vertical viewing angles determined based on sensor data obtained via the one or more sensors The method may further include rendering a view of the 3D representation on the external facing display based on the observer-based viewing characteristic.