LED Visual Messaging Device Power Over Ethernet
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Solution Overview
Problem
Traditional LED displays are unable to operate efficiently using low power sources, such as those provided by IEEE 802.3af Power over Ethernet (PoE) technology, due to high power requirements for displaying colors like yellow, which exceeds the 15.4 Watts capacity.
Innovation Solution
The implementation of high efficiency LEDs, current-driven circuits, and a 1× yellow algorithm that achieves yellow color by illuminating red and green LEDs sequentially, reducing instantaneous current consumption by half, allowing the display to operate within the PoE power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LED displays use simultaneous red and green LEDs to create yellow color, then color representation is achieved, but power consumption doubles compared to single color LEDs
Solution Approach 1:
The patent applies periodic action by sequentially activating red and green LEDs in alternating time slots rather than simultaneously. The red LED is activated during one time slot and the green LED during the next time slot, creating a temporal sequence that the human eye integrates as yellow color. This periodic switching reduces instantaneous power consumption while maintaining color representation through persistence of vision.
Solution Approach 2:
The patent implements dynamics by making the LED activation pattern time-dependent and variable. The system dynamically switches between different LED states (red only, green only, both sequentially) based on the required color output and power availability. This dynamic control allows the display to adapt between power-saving mode and full-color mode, optimizing the trade-off between power consumption and color fidelity.
2Adaptability or versatility
If traditional LED displays are designed for high power operation, then sufficient brightness and color are achieved, but they cannot operate on PoE power sources limited to 15.4 Watts
Solution Approach 1:
The patent applies parameter changes by modifying the temporal parameters of LED operation. Instead of continuous operation, the system uses duty-cycled operation with variable time slots for red and green LED activation. By adjusting the duration and frequency of LED activation, the system reduces average power consumption to match PoE limitations while maintaining sufficient visual output through increased peak intensity during active periods.
Solution Approach 2:
The system uses periodic action to create time-multiplexed operation where LEDs are activated in alternating cycles. This periodic switching allows the display to operate at lower average power levels compatible with PoE while maintaining color representation through the persistence of vision effect, where the human eye integrates the sequential red and green stimuli as simultaneous yellow color.
3Illumination intensity
If yellow color is created by simultaneous red and green LEDs, then accurate color representation is achieved, but instantaneous current consumption is doubled
Solution Approach 1:
The patent resolves this contradiction by using periodic action to separate red and green LED activation into alternating time slots. During each time slot, only one LED type is activated, halving the instantaneous current consumption. The rapid alternation between red and green activation creates a temporal sequence that the human visual system integrates as yellow color, maintaining color accuracy while reducing peak current draw.
Solution Approach 2:
The human visual system acts as an intermediary that integrates the sequential red and green light stimuli into the perception of yellow color. The patent exploits this biological intermediary by timing the red and green LED activations so that their sequential output is perceived as simultaneous yellow, allowing the system to achieve accurate color representation without requiring both LEDs to be active at the same 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
This approach significantly reduces power consumption, enabling LED displays to be powered solely by PoE sources without a separate AC supply, while maintaining effective color representation.
Implementation Method 1
Typical LED displays can emit red, green and yellow pixels. In conventional LED displays, yellow color is achieved by powering both a red and green LED die within the same pixel simultaneously.
Implementation Method 2
The human eye integrates these time-separated colors in such a way as to form the color yellow.
Data Source
AI summary
A visual messaging system and device can employ high efficiency LEDs and current driven versus voltage driven circuits to reduce power consumption and enable the device to be powered from IEEE 802.3af (Power over Ethernet (PoE)) standard based power sources. The device can be powered from a local area network (LAN) connection using PoE, and does not require a separate AC power supply. The present invention also uses a 1× yellow algorithm to create the yellow color with one half the instantaneous current of previous circuits. The device can incorporate multiple message inputs for receiving and displaying messages having different priorities, allowing higher priority messages to override lower priority messages.