Gaze-Adaptive Pixel Density Projection for Head-Mounted Displays
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Solution Overview
Problem
Head-mounted display apparatuses face challenges in achieving high resolution at a wide visual angle and center of the field of view while maintaining low cost, small size, and low power consumption, as they typically require multiple display devices to achieve these features.
Innovation Solution
An image display apparatus with a controller, circuit unit, image projector, gaze-direction detector, and driver that adjusts the projection direction based on the user's gaze direction, allowing for a single display device to dynamically change pixel density and resolution from high at the center to low at the periphery, matching the projection with the user's gaze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple display devices are used to achieve high resolution at wide visual angle and center of field of view, then image quality is improved, but device complexity, cost, and power consumption increase
Solution Approach 1:
The patent applies dynamics by making the pixel density dynamically adjustable across different regions of the display. The system changes the concentration of pixel emission points based on the displayed content characteristics, transitioning from a static uniform pixel distribution to a dynamic adaptive distribution that optimizes resolution where needed while reducing complexity elsewhere
Solution Approach 2:
The patent implements local quality by creating regions of different pixel densities within the same display device. High-density regions are concentrated at the center of the field of view where resolution is most critical, while peripheral regions use lower density. This localized variation in quality allows the system to achieve high resolution at the center without requiring multiple display devices throughout the entire display area
2Measurement precision
If multiple display devices are used to achieve high resolution at wide visual angle and center of field of view, then image quality is improved, but cost increases
Solution Approach 1:
The patent merges the functions of multiple display devices into a single display device by implementing variable pixel density within one device. Instead of manufacturing and assembling multiple separate display devices to achieve different resolution levels in different regions, the system combines high-resolution and low-resolution regions into a single integrated display, reducing manufacturing complexity and cost
3Measurement precision
If multiple display devices are used to achieve high resolution at wide visual angle and center of field of view, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality to power consumption optimization by concentrating high-power consumption activities (high-density pixel rendering) only in the central region where maximum resolution is needed, while peripheral regions operate at lower power consumption levels with reduced pixel density. This localized approach to quality and power management reduces overall power consumption compared to using multiple full-power display devices
Data Source
AI summary
The image display apparatus generates a driving control signal for generating image light on the basis of an image signal, and allows an image projector to generate the image light to form a pixel on a screen in accordance with a modulation timing by performing modulation driving for a light source, and to generate the image light so as to scan the screen while a light emission direction of the image light changes by performing scan driving, allows a gaze-direction detector to detect a gaze direction of a user, and allows a projection-direction driver to change a projection direction of the image light in accordance with the gaze direction. In the first mode, the image display apparatus controls modulation driving and scan driving so that a configuration of a pixel region on the screen changes from a relatively high pixel density region to a relatively low pixel density region.