HMD Dark Adaptation Accessory with LED Bleaching and Safety Circuitry
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) are inadequate for dark adaptation testing due to hardware limitations, such as inability to provide sufficient bleaching light and lack of safety features to prevent overexposure, which can lead to user discomfort and eye damage.
Innovation Solution
A dark adaptation accessory is designed to be attached to HMDs, featuring a light shield casing with apertures for camera and microphone functionality and a set of LEDs emitting bleaching light, along with safety circuitry to control and deactivate the LEDs to prevent overexposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional HMDs are used for dark adaptation testing, then eye comfort during over-long user sessions is maintained, but the intensity of light needed to bleach retinas cannot be provided
Solution Approach 1:
The system is divided into two separate functional components: a conventional HMD for displaying stimuli and measuring eye responses, and a separate light source device for providing controlled bleaching light. This segmentation allows each component to be optimized for its specific function while preventing the harmful effects of uncontrolled high-intensity light exposure.
Solution Approach 2:
A light shield with controlled apertures acts as an intermediary between the high-intensity light source and the user's eye. The light shield allows precise control of light exposure by blocking or permitting light passage through specific openings, enabling the system to provide necessary bleaching light while preventing overexposure and eye damage.
2Adaptability or versatility
If attachments are added to HMD to provide bleaching light, then dark adaptation testing capability is enabled, but HMD cameras may be covered up, inhibiting positioning operations
Solution Approach 1:
The light shield is designed with non-uniform structure featuring specific apertures positioned to provide bleaching light to the eye while leaving other areas open for camera access. This local differentiation allows different regions of the light shield to serve different functions: one region controls light exposure while another region maintains camera visibility and functionality.
3Reliability
If safety features are added to control bleaching light, then user safety is improved, but device complexity increases
Solution Approach 1:
The light shield is designed with pre-configured apertures and light-blocking structures that physically prevent overexposure before it can occur. This preliminary protective design built into the hardware structure provides inherent safety without requiring complex control circuitry or software algorithms to monitor and adjust light exposure in real-time.
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
The accessory enables effective bleaching light exposure for dark adaptation testing while ensuring user safety by controlling light intensity and duration, allowing for accurate eye-related data collection without causing harm.
Implementation Method 1
The attachment body may include a set of light-emitting diodes (LEDs) to emit light at a bleaching intensity
Data Source
AI summary
A head-mounted display and accessory system in which the accessory emits bleaching light through the head-mounted display to bleach photoreceptors for dark adaptation testing includes a casing, where a lens of a head-mounted display is positioned inside the cavity, and where an aperture of the casing is aligned with an exterior-facing camera of the head-mounted display. The system also includes an attachment body, where a posterior end of the attachment body is fixed to an anterior end of the casing, and where the attachment body includes a set of light-emitting diodes (LEDs), where the set of LEDs is attached to the posterior end of the attachment body and is directed towards the lens. The system also includes a circuitry that is configured to control light emission of the set of LEDs.