Safety Sign Display With Optical Monitoring Control Area
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Solution Overview
Problem
Safety or escape sign luminaires with electronic displays face high risks due to non-functional or incorrect representation of safety-critical information, which can lead to potential hazards during evacuations.
Innovation Solution
Incorporating a separate, non-visual control area with sensors to monitor the functionality of the display cells, ensuring the reliability of safety-critical information, and using an opaque cover to prevent visual recognition and enhance mechanical protection, while also providing an optically unchangeable display area for standardized information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optically variable display area is added to display safety-critical information, then the functionality and information display capability are improved, but the reliability and safety risk are worsened due to potential malfunctions and incorrect display
Solution Approach 1:
The patent creates a control area that is an optical copy or replica of the primary display area, using identical LCD cells and optical structure. This control area receives the same electrical signals as the primary display, allowing the sensor to detect whether the display is showing the intended information by comparing the optical output. This copying approach enables verification of display accuracy without adding fundamentally new components.
Solution Approach 2:
The patent implements a feedback mechanism where a sensor continuously monitors the optical output of the display cells and feeds this information back to a control unit. The control unit compares the actual display output with the intended display state and can trigger alerts or shutdowns if discrepancies are detected. This closed-loop feedback system automatically detects and responds to display malfunctions, enhancing safety reliability.
2Reliability
If a sensor and control area are added to monitor display functionality, then the safety monitoring capability is improved, but the device complexity increases
Solution Approach 1:
The patent designs the control area to serve multiple functions: it acts as both a monitoring target for the sensor and as part of the overall display structure. The same LCD cells and optical components are used in both the primary display and control area, allowing a single structural element to fulfill dual purposes. This multi-functionality reduces the need for separate monitoring components and simplifies the overall system architecture.
Solution Approach 2:
The patent merges the control area with the primary display area by using identical cell structures and integrating them into a single housing. The sensor is positioned to monitor both areas simultaneously, and the control unit processes signals from both regions. This merging approach consolidates multiple functions into unified structures, reducing the total number of discrete components and simplifying the system while maintaining comprehensive monitoring capability.
3Reliability
If the control area is made visually undetectable by covering with opaque material, then the safety of information display is improved, but the mechanical strength and protection are reduced
Solution Approach 1:
The patent applies opaque covering material selectively only to the control area portion of the display, leaving the primary display area fully visible. This localized application of opacity ensures that the control area remains visually undetectable from the front, preventing confusion about the displayed information, while the primary display maintains full visual clarity. The differential treatment of different areas allows each to fulfill its specific function optimally.
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
This design ensures a high safety requirement level by reliably monitoring and maintaining the accuracy of safety-critical information, improving readability and mechanical resilience, and simplifying the construction of the safety or escape sign light.
Implementation Method 1
the sensor is optically coupled to the second cell
Data Source
Figure 1
Figure 2
AI summary
A safety or emergency exit sign luminaire with an electronic display (4) is shown. The display display comprises cells (6), in particular LCD cells, and thus forms a first, optically variable display area (5) on the safety or emergency exit sign luminaire (1) for displaying, in particular, safety-critical information. The display display also includes a sensor (8). To ensure a high level of safety even with an optically variable display area of the safety or emergency exit sign luminaire, it is proposed that the first cells (6.1) of the display (4) form the first display area (5), and at least one second cell (6.2) forms a control area (9) arranged separately from the first display area (5). This control area (9) is not visually discernible when looking at the display (4), and its second cell (6.2) is optically coupled to the sensor (8) for monitoring the electronic display (4).