Display Thermal Management Using Distributed Microcontrollers
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Solution Overview
Problem
Large-scale electronic displays face challenges with condensation issues due to temperature and humidity fluctuations, particularly during startup, which can lead to electronic failures and require complex temperature control to manage condensation and maintain optimal operational conditions.
Innovation Solution
The implementation of a crossflow heat-exchanger with distributed microcontrollers and a CAN bus communication system allows for precise control of fan speeds and heat exchange, managing temperature differentials and humidity levels to prevent condensation, and includes a pre-heating mechanism to ensure safe startup conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat-exchanger is incorporated into the display to prevent overheating, then cooling efficiency is improved, but condensation problems occur during startup and operation
Solution Approach 1:
The system performs preliminary heating of the display housing before startup using heating elements positioned strategically within the housing. This pre-heating action raises the internal temperature above the dew point, preventing condensation from forming on the heat-exchanger surfaces when cold ambient air is subsequently introduced for cooling operations.
Solution Approach 2:
The system dynamically adjusts fan speeds based on real-time temperature readings from multiple sensors positioned at different locations within the display housing. The microcontroller processes these temperature differential readings and modulates fan motor speeds accordingly, optimizing cooling efficiency while minimizing the risk of condensation by controlling the rate and temperature of air exchange.
2Reliability
If multiple sensors and control systems are added to manage condensation, then reliability is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into modular components: individual temperature sensors positioned at specific locations (front, rear, top, bottom of housing), separate heating elements in different zones, and a centralized microcontroller that processes readings from all sensors independently. This segmentation allows each component to perform a specific function reliably while the overall system remains manageable through modular architecture.
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 enhances the reliability and efficiency of large-scale electronic displays by maintaining uniform temperature distribution, reducing the risk of condensation, and ensuring optimal operational conditions, thereby extending component lifespan and reducing maintenance costs.
Implementation Method 1
the heat-exchanger may contribute to condensation problems upon start-up of the display, or due to unfavourable ambient conditions whilst the display is running
Implementation Method 2
WO 2012018481 discloses multiple fans that force cooling gas through multiple channels, responding to temperature measurements in the channels
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
An electronic display has a display panel (313) with a display surface that is visible through a housing (120). An electronic processor (315) controls functions of the display and operating conditions within the housing (120). Input sensors (300-311) are disposed within the housing (120) at distributed locations and arranged to sense operating conditions within the housing (120). Output components (101,102, 202, 203) are disposed within the housing at distributed locations and arranged to respond to control signals. Modules each have a unique address identifier and at least one connection to one of the input sensors (300-311) and output components (101,102, 202, 203). A CAN bus provides communication between the modules and electronic processor (315). Processing of signals received from the input sensors (300-311) and control signals passed to the output components (101,102, 202, 203) is distributed amongst microcontrollers on the modules. The electronic processor (315) uses one or more unique address identifier to receive a temperature reading from a module connected to a temperature sensor (300-311); process the temperature reading to determine one or more new fan speed setting; and send data via the bus to a module to set at least one fan speed (101,102) to the new setting.