HMD Display Layout for Eye Tracking and Local Pixel Density
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Solution Overview
Problem
Existing head-mounted display (HMD) devices face challenges in accurately tracking user gaze and obtaining biometric information due to limitations in display resolution and eye-tracking sensor placement, which affects image quality and functionality.
Innovation Solution
The HMD apparatus incorporates a display with varying pixel densities and strategically positions eye-tracking sensors and light sources to enhance gaze tracking and biometric information acquisition, utilizing a higher pixel density in a region of interest and optimizing sensor placement for improved light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the eye-tracking sensor is positioned adjacent to the display, then the gaze tracking functionality is enabled, but the display resolution in the sensor region is reduced
Solution Approach 1:
The display employs different pixel densities in different regions: a first display region with higher pixel density for main visual content and a second display region with lower pixel density where the eye-tracking sensor is positioned. This local differentiation allows the sensor to function effectively while maintaining high display quality in critical viewing areas.
Solution Approach 2:
The display is segmented into multiple regions with different functional requirements. The first display region is optimized for high-resolution content display, while the second display region is optimized for sensor light reception. This segmentation resolves the conflict between sensor placement and display resolution by assigning different quality requirements to different spatial zones.
2Manufacturing precision
If the pixel density is increased in the region of interest, then the image quality is improved, but the light reception for eye-tracking sensor is reduced
Solution Approach 1:
The display provides high image quality locally in the first display region where users primarily view content, while the second display region accepts lower pixel density to maximize light transmission to the eye-tracking sensor. This local quality differentiation ensures that image quality improvements in one area do not compromise sensor performance in another area.
3Volume of moving object
If the eye-tracking sensor and light source are positioned close to the display, then the device compactness is improved, but the light reflection reception is compromised
Solution Approach 1:
The optical system is designed to collect reflected light from multiple angular dimensions. The eye-tracking sensor and light source are positioned to capture light reflections across different angles, effectively using dimensional space to overcome the limitations of compact physical spacing and maintain adequate light reception capability.
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 configuration improves gaze tracking accuracy and biometric information collection, ensuring enhanced user interaction and image quality by maintaining high resolution in the region of interest while optimizing sensor performance.
Implementation Method 1
reflected light, the reflected light being at least a portion of the light emitted from the at least one light source and reflected from eyes of the user
Data Source
AI summary
A head mounted display (HMD) apparatus may include: a display; an optical lens adjacent to a first side of the display; at least one light source configured to emit light; and at least one eye-tracking sensor adjacent to a second side of the display and configured to obtain gaze information about a user by receiving reflected light that is the light emitted from the at least one light source and reflected off eyes of the user. The display may include a second display region corresponding to a position of the at least one eye-tracking sensor, and a first display region other than the second display region. A number of pixels per unit area of the first display region may be greater than a number of pixels per unit area of the second display region.