Light Therapy System with Display Compensation for Melanopic Exposure
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Solution Overview
Problem
Current light therapy systems for patients in clinical settings, such as ICUs, face challenges in delivering a precise melanopic luminous exposure due to the additional light exposure from visual displays, which can disrupt the intended light therapy schedule and impact the patient's circadian rhythm.
Innovation Solution
A light therapy system that includes a lighting assembly with controllable illuminance and a visual display means, where a controller adjusts the target melanopic luminous exposure to compensate for the additional exposure from the visual output, ensuring the delivery of a specific melanopic luminous exposure over a defined treatment period by creating a control schedule for the lighting assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a visual display means is added to provide visual output to patients, then patient entertainment and relaxation are improved, but the precision of melanopic luminous exposure delivery deteriorates due to additional unwanted light exposure
Solution Approach 1:
The controller calculates the melanopic luminous exposure from the visual display means based on its luminous characteristics, and uses this feedback information to adjust the target melanopic luminous exposure for the lighting assembly, ensuring precise total exposure delivery
Solution Approach 2:
The system performs preliminary calculation of the additional melanopic luminous exposure from the visual display means before executing the light therapy, and adjusts the target exposure accordingly to compensate for the display's contribution
2Measurement precision
If the target melanopic luminous exposure is increased to account for visual display output, then total exposure accuracy is improved, but the lighting assembly's illuminance control complexity increases
Solution Approach 1:
The controller adjusts the target melanopic luminous exposure parameter by reducing it based on the calculated additional exposure from the visual display means, thereby maintaining accurate total exposure delivery through parameter modification rather than complex control mechanisms
3Reliability
If light therapy is administered to restore circadian rhythm, then patient sleep quality and delirium prevention are improved, but the system must account for multiple light sources which increases measurement difficulty
Solution Approach 1:
The controller acts as an intermediary that calculates and aggregates the melanopic luminous exposure from both the lighting assembly and visual display means, providing a unified measurement and control mechanism that simplifies the overall exposure assessment
Data Source
AI summary
A light therapy system (12) for administering a controllable melanopic luminous exposure includes a controllable lighting assembly (16) for use in delivering the desired luminous exposure. The system further includes a visual display means (18) for presenting at the same time a visual output such as a video to the patient. A target melanopic luminous exposure for administration to the patient is received by a controller 24. This target is then adjusted to compensate for an additional melanopic luminous exposure which the visual display means generates in displaying the visual output. A control schedule is then generated for controlling an illuminance of the lighting assembly to deliver over a defined treatment period the adjusted target melanopic luminous exposure. The lighting assembly is then controlled according to the control schedule. In this way both the visual output of the visual display means and the light output of the lighting assembly can be administered, while ensuring that the original target melanopic luminous exposure is delivered and not exceeded.