Head-Mounted Shutter Projection Display for Ambient Light Contrast
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Solution Overview
Problem
Existing head-mounted display devices face challenges in maintaining clear information presentation under varying light conditions, often distracting users and exposing them to harmful UV radiation, while also requiring high energy consumption.
Innovation Solution
A device with a shutter mechanism that switches between transparent and opaque states, combined with a projection system, synchronizes light intensity and transparency to optimize contrast and reduce energy usage, allowing users to perceive both information and their environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a projection device displays information continuously, then information visibility is maintained, but energy consumption increases and ambient light interference worsens
Solution Approach 1:
The shutter device alternates between transparent and opaque states in periodic cycles, allowing the projection device to display information only during opaque phases when ambient light is blocked. This periodic operation reduces energy consumption compared to continuous display while maintaining information visibility through temporal synchronization.
Solution Approach 2:
The system dynamically adjusts the transparency state of the shutter device based on the display phase. During information display, the shutter becomes opaque to enhance contrast; during non-display phases, it becomes transparent to allow environmental perception. This dynamic state change optimizes both energy efficiency and information delivery.
2Loss of information
If the shutter device remains opaque to block ambient light, then information contrast improves, but user perception of surroundings is reduced
Solution Approach 1:
The shutter device operates in periodic cycles, alternating between opaque states for high-contrast information display and transparent states for environmental perception. This temporal separation allows the user to experience both high contrast during information presentation and full environmental awareness during transparent phases.
Solution Approach 2:
The shutter device dynamically transitions between opaque and transparent states synchronized with the projection display timing. During information display intervals, it adopts an opaque state to maximize contrast; during intervals between displays, it becomes transparent to restore environmental perception, thus adapting to different functional requirements.
3Loss of information
If the projection device increases light intensity to improve visibility, then information contrast improves, but energy consumption increases
Solution Approach 1:
The projection device emits light in periodic pulses synchronized with the shutter's opaque phases rather than continuously. This pulsed operation maintains information visibility during display intervals while significantly reducing average energy consumption compared to continuous high-intensity illumination.
Solution Approach 2:
The projection device dynamically adjusts its light emission intensity and timing based on the shutter state and display requirements. High light intensity is applied only during brief display intervals when the shutter is opaque, while low or zero intensity is used during transparent phases, optimizing the balance between visibility and energy consumption.
4Loss of information
If glasses are worn for long periods to provide continuous information, then information availability increases, but exposure to harmful UV radiation increases
Solution Approach 1:
The shutter device periodically alternates between opaque and transparent states, allowing UV protection during opaque phases when information is displayed, while briefly permitting environmental perception during transparent phases. This periodic operation reduces cumulative UV exposure compared to continuous wearing of permanently opaque protective glasses.
Solution Approach 2:
The shutter device acts as an intermediary between the user's eyes and the external environment, providing UV protection during information display phases while occasionally allowing environmental perception. This mediates the conflict between information availability and UV protection by controlling the timing and duration of exposure.
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
Improves information contrast and safety by minimizing ambient light interference and reducing energy consumption, enabling users to see both displayed information and their surroundings effectively.
Implementation Method 1
A shutter device (3) mounted by means of the support frame (2), which shutter device (3) is switchable between a state of increased transparency and a state of lower transparency for visible electromagnetic radiation
Implementation Method 2
a projection device (4) which is mounted by means of the carrier frame (2) and by means of which visible electromagnetic radiation for the display of information can be emitted
Data Source
AI summary
The disclosure relates to a device for displaying information to a user, including a support frame for mounting the device on a body part of a user, and including a shutter device which is mounted by the support frame and can be switched between a state of increased transparency and a state with lower transparency for visible electromagnetic radiation relative to the state of increased transparency. The device includes a projection device which is mounted by the carrier frame and by which visible electromagnetic radiation for the display of information can be emitted in such a way that can be perceived by the user. The shutter device and the projection device are arranged relative to one another in such a way that, during a state of reduced transparency, information can be displayed by the projection device for the user on a projection surface surrounded by the shutter device.