Retinal Projection Head-Mounted Display for Visual Field Abnormalities
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Solution Overview
Problem
Conventional image projection devices are unable to project the entire range of an image to individuals with visual field abnormalities, such as visual field contraction, resulting in incomplete image perception.
Innovation Solution
An image projection system that adjusts image projection based on individual visual field data, using a retinal projection head-mounted display with a Maxwellian view to converge image light beams at the pupil, allowing only the visible portion of the image to be projected within the user's limited visual field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the entire range of an image is projected onto the retina as in conventional image projection devices, then the complete image information is available, but persons with visual field abnormalities cannot perceive the entire image
Solution Approach 1:
The patent applies local quality by adjusting the projection characteristics of different regions of the image according to the user's visual field sensitivity. The image is divided into multiple regions, and each region is projected with different luminance or contrast adjustments based on the user's visual field data, ensuring that information in all regions is perceptible despite varying visual capabilities across the visual field.
Solution Approach 2:
The patent employs dynamics by making the projection parameters adaptive and changeable based on real-time or pre-measured visual field characteristics. The system dynamically adjusts the projected image properties (such as luminance, contrast, or position) according to the user's specific visual field abnormalities, allowing the projection to optimize for each user's unique visual capabilities.
2Ease of operation
If image projection is adjusted to fit within limited visual field, then users with visual field abnormalities can perceive the image, but the entire image range cannot be displayed
Solution Approach 1:
The patent applies dimensionality change by utilizing the temporal dimension to compensate for spatial limitations. Since the visual field is limited in space, the system projects different regions of the image sequentially over time, allowing users to perceive the complete image information through temporal integration rather than simultaneous spatial presentation.
Solution Approach 2:
The patent segments the image into multiple regions or zones, and projects these segments in a sequence that matches the user's visual field characteristics. By dividing the complete image into manageable portions and presenting them systematically, the system ensures that all image information is conveyed despite the limited visual field.
3Device complexity
If conventional image projection is used, then the projection system is simple, but it cannot accommodate individual visual field characteristics
Solution Approach 1:
The patent applies preliminary action by obtaining visual field characteristics data before the actual image projection process. Visual field measurements or assessments are conducted in advance, and the results are stored and used to configure the projection parameters. This preliminary preparation allows the system to adapt to individual users without adding complexity to the real-time projection operation.
Solution Approach 2:
The patent uses copying by creating a digital representation or model of the user's visual field characteristics. Instead of directly modifying the physical projection system for each user, the system copies the visual field data into a digital format that can be processed and used to generate appropriate projection parameters, simplifying the adaptation process.
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
Enables users with visual field abnormalities to perceive images effectively by projecting only the visible portion of the image, enhancing their ability to view important information without missing critical parts.
Implementation Method 1
using a retinal projection head-mounted display with a Maxwellian view to converge image light beams at the pupil
Data Source
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AI summary
A terminal device (300) includes a projection target holding unit that holds projection information to be projected by an image projection device (200), a storage unit that stores position information indicating a position on the retina of a user (P) at which the projection information is to be projected, a position information acquisition unit that acquires the position information from the storage unit, an image data generation unit that generates image data (D) of an image (202G) that projects the projection information at the position indicated by the position information, and an image output processing unit that outputs the image data (D) to the image projection device (200). The image projection device (200) includes a light source unit that emits a light beam, an image input unit that inputs the image data (D) from the terminal device (300), a control unit that generates an image light beam based on the input image data (D) and controls emission of the image light beam from the light source unit, a scanning mirror that scans the image light beam, and a projection unit that projects the image light beam on the retina of the eyeball of the user (P) as the image (202G) represented by the image data (D).