HMD Luminance Control for Visibility in Wide Dynamic Range
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Solution Overview
Problem
High-luminance images in head-mounted displays can appear blurry or hard to see due to changes in light exposure, leading to reduced visibility and impaired image quality, especially when transitioning from bright to dark environments.
Innovation Solution
An image displaying system that detects changes in light exposure and adjusts the luminance distribution of images using a luminance conversion section, controlled by a luminance distribution controlling section, to maintain optimal visibility and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance range of display is increased to represent high-luminance light realistically, then the image quality and reality are improved, but the visibility of important objects in low or medium luminance regions deteriorates due to photoreceptor cell adaptation changes
Solution Approach 1:
The patent applies dynamic luminance adjustment by detecting the user's gaze direction and dynamically modifying the luminance distribution of displayed images. When the user's eyes are detected to be in a specific region, the system adjusts the luminance of that region in real-time to maintain optimal visibility, allowing the display to adapt between wide luminance range and maintained visibility based on viewing conditions
Solution Approach 2:
The patent implements local luminance adjustment by targeting specific regions of the image based on gaze detection. Instead of uniformly adjusting the entire image luminance, the system applies localized luminance modification to the region where the user is looking, preserving the high-luminance characteristics in that specific area while maintaining overall image quality and visibility
2Manufacturing precision
If many gradations are allocated to important objects to present high-resolution feeling, then the representation quality is improved, but the actual visibility of these objects deteriorates due to data conversion and processing losses
Solution Approach 1:
The patent employs feedback mechanisms through gaze detection to monitor user attention and uses this information to adjust luminance in real-time. This feedback loop ensures that important objects maintain optimal visibility by continuously adapting the display based on where the user is looking, compensating for any visibility losses from data conversion processes
Data Source
AI summary
An image generation apparatus increases an adjustment amount of a luminance distribution to a target value B at a time t0 at which an amount of light entering the eyes of a user changes to such a degree that the change has an influence on an action of photoreceptor cells, to thereby cause a head-mounted display to display an image 310b having a luminance increased from that of an original image 310a. The image generation apparatus gradually decreases the adjustment amount of the luminance distribution during a restoration period Δt in such a manner that an image 310c having the original luminance distribution is displayed at a later time t1.