LED Module Condensation Prevention via Dew Point Control
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Solution Overview
Problem
Display apparatuses in high-humidity environments face condensation issues due to penetrating water vapor, leading to deterioration, as existing solutions like fans and temperature/humidity sensors do not effectively prevent condensation within the device.
Innovation Solution
A display apparatus with a temperature controller and sensor system that adjusts the temperature of the light emitting diode module to be above the dew point, using a heater and fan to prevent condensation, and communicates with external devices to control ambient conditions based on measured humidity and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus operates in a high-humidity environment, then the display apparatus can function in various environments, but water vapor penetrates and condenses inside the display apparatus causing deterioration
Solution Approach 1:
The controller performs preliminary action by calculating the dew point temperature based on ambient temperature and humidity measurements before condensation occurs. When the measured temperature approaches or falls below the dew point, the controller proactively activates the heater to raise the temperature above the dew point, preventing water vapor condensation before it can cause damage to the display apparatus.
Solution Approach 2:
The system changes the temperature parameter of the light emitting diode module by activating the heater when the measured temperature is at or below the dew point temperature. This parameter change (temperature increase) ensures that the internal temperature remains above the dew point, preventing condensation while allowing the display apparatus to operate in high-humidity environments.
2Temperature
If a fan is used to cool the light emitting diode module, then the temperature is reduced, but this may cause the temperature to fall below the dew point and induce condensation
Solution Approach 1:
The system implements feedback control by continuously monitoring the temperature of the light emitting diode module and comparing it with the calculated dew point temperature. Based on this feedback, the controller dynamically adjusts the heater operation - activating it when the temperature approaches or falls below the dew point, and deactivating it when the temperature is safely above the dew point. This feedback mechanism prevents condensation while allowing effective cooling.
Solution Approach 2:
The controller applies preliminary anti-action by activating the heater before the temperature drops below the dew point. Instead of waiting for condensation to occur, the system preemptively heats the module when the temperature approaches the dew point, counteracting the cooling effect and preventing condensation from forming in the first place.
3Reliability
If the temperature of the light emitting diode module is increased to prevent condensation, then condensation is prevented, but energy consumption increases
Solution Approach 1:
The heater operates periodically rather than continuously. The controller calculates the dew point temperature and only activates the heater when the measured temperature is at or below the dew point. This periodic operation - heating only when necessary to prevent condensation - significantly reduces energy consumption compared to continuous heating, while still maintaining reliable condensation prevention.
Solution Approach 2:
The system applies partial action by using the heater only to the extent necessary to raise the temperature above the dew point, rather than maintaining a constantly high temperature. The heater provides just enough heating to prevent condensation, minimizing energy consumption while achieving the reliability goal of preventing water vapor condensation inside the display apparatus.
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
Effectively prevents water vapor condensation within the display apparatus, thereby reducing the risk of damage and ensuring reliable operation in humid environments.
Implementation Method 1
a temperature sensor provided in the light emitting diode module
Implementation Method 2
the temperature controller may include a heater provided on the printed circuit board, and drives the heater when the measured temperature is above the dew point temperature during the standby mode
Implementation Method 3
The temperature controller may include a fan circulating air inside the cabinet, and drives the fan when the measured temperature is above the dew point temperature during the standby mode
Implementation Method 4
water vapor that has penetrated the display apparatus may condense inside the display apparatus, thereby deteriorating the display apparatus
Data Source
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AI summary
A display apparatus includes a cabinet; a light emitting diode module provided in the cabinet; a communicator configured to receive an ambient atmospheric measurement value of the cabinet from an external device; a temperature sensor provided in the light emitting diode module; and a temperature controller configured to control a temperature of the light emitting diode module; and a controller configured to control the temperature controller so that the temperature of the light emitting diode module is greater than a dew point temperature when the measured temperature based on the output of the temperature sensor in a standby mode in a power saving state is equal to or lower than the dew point temperature based on the ambient atmospheric measurement value, and drives the light emitting diode module so that the temperature of the light emitting diode module is greater than the dew point temperature when the measured temperature is below the dew point temperature based on the ambient atmospheric measurement value when switching to an active mode in a normal power supply state.