Digital Signage Luminance Control via PSU Count
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Solution Overview
Problem
Digital signage systems often face issues with overcurrent due to users setting higher luminance levels than what the power supply units can provide, leading to potential damage and inefficient power usage.
Innovation Solution
A digital signage system with a system controller that adjusts the settable maximum luminance value based on the number of power supply units, displaying a luminance range guide bar and limiting the selectable range to prevent overcurrent, and providing a warning for unsuitable luminance settings, while also adjusting the current supplied to LED driver modules for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of power supply units is increased to provide higher luminance, then the luminance capability is improved, but the device complexity and cost increase
Solution Approach 1:
The system dynamically adjusts the settable maximum luminance value based on the detected number of power supply units. When fewer PSUs are installed, the controller limits the luminance setting range accordingly, allowing the system to maintain high luminance capability when needed while avoiding unnecessary complexity when lower luminance suffices.
2Ease of operation
If the luminance setting range is kept fixed regardless of PSU count, then the ease of operation is improved, but the reliability deteriorates due to overcurrent risk
Solution Approach 1:
The controller detects the number of installed power supply units and uses this feedback to dynamically adjust the settable maximum luminance value. This feedback mechanism ensures that the luminance setting always matches the actual power supply capability, preventing overcurrent conditions while maintaining user-friendly operation within safe limits.
Solution Approach 2:
The system takes preliminary action by limiting the settable maximum luminance value before the user can make an inappropriate setting. By pre-calculating and restricting the available luminance range based on PSU count, the system prevents overcurrent conditions from occurring in the first place, rather than reacting after damage occurs.
3Reliability
If the settable maximum luminance value is dynamically adjusted according to PSU count, then the reliability is improved by preventing overcurrent, but the device complexity increases
Solution Approach 1:
The controller performs preliminary detection of the power supply unit count and pre-establishes the appropriate maximum luminance limit before any luminance setting operations occur. This preliminary configuration simplifies subsequent operations by automatically constraining the setting range, reducing the need for complex real-time monitoring and adjustment mechanisms.
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 solution minimizes the risk of overcurrent and damage, informs users of suitable luminance settings, and expands the selectable luminance range by adjusting the current supply, ensuring reliable and efficient operation.
Implementation Method 1
a plurality of light emitting diode (LED) driver modules configured to provide light to the panel
Data Source
AI summary
Disclosed herein are a digital signage system for limiting a luminance range settable by a user according to the number of power supply units (PSUs) and a method of operating the same. The digital signage system includes a panel configured to display an image, a plurality of light emitting diode (LED) driver modules configured to provide to the panel, a display device including at least one power supply unit configured to supply power to the panel and the plurality of LED driver modules, and a system controller configured to control the display device. The system controller includes a display configured to display a luminance setting screen for controlling luminance of the image and a controller configured to change a settable maximum luminance value according to the number of power supply units when the luminance setting screen is displayed.