Head-Mounted Display Visual Line Direction Control
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Solution Overview
Problem
Existing head-mounted display devices face challenges with processing load, size reduction, cost, and user convenience due to high processing demands when displaying multiple virtual images or large image capacities, particularly in transmission types where users cannot see the outside scene.
Innovation Solution
A head-mounted display device with an image display section, a visual-line-direction specifying section, and an image changing section that adjusts the display image based on the user's visual line direction, incorporating features like saccade consideration and outside-scene image pickup to enhance processing speed and user recognition without compromising visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple virtual images are displayed in divided regions, then the information provision to user is improved, but the processing load increases
Solution Approach 1:
The patent applies local quality by displaying full-resolution images only in the central visual field region where the user's visual acuity is highest, while displaying lower-resolution or simplified images in peripheral regions. This resolves the contradiction by providing sufficient information in the critical central region without unnecessarily increasing processing load for peripheral regions where the user cannot perceive fine details anyway.
2Manufacturing precision
If image resolution and capacity are increased, then the display quality is improved, but the processing load increases
Solution Approach 1:
The patent implements local quality by varying the image resolution and processing level according to the visual field region. High-resolution processing is applied only to the central region where the user can perceive quality differences, while peripheral regions use lower resolution. This maintains display quality where it matters most while significantly reducing the overall processing load.
Solution Approach 2:
The patent applies partial action by processing and displaying high-quality images only for the portion of the visual field that the user can actually perceive with high acuity (the central region), rather than uniformly processing the entire field of view. This eliminates wasted processing on peripheral regions where the user cannot distinguish quality differences.
3Ease of operation
If the display region is expanded to cover wider visual field, then the user convenience is improved, but the processing load increases
Solution Approach 1:
The patent resolves this contradiction by expanding the display region to cover the wide visual field while applying different processing levels to different regions. The central region receives full processing for high quality, while peripheral regions use reduced processing. This maintains user convenience of wide field coverage without the proportional increase in processing load that uniform high-quality processing would require.
Data Source
AI summary
A head-mounted display device includes an image display section capable of displaying an image in a display region, a visual-line-direction specifying section configured to specify a visual line direction of a user, and an image changing section configured to change, according to the specified visual line direction, a display image displayed in the display region.