Projection Display Cooling Control via Air Volume Feedback
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Solution Overview
Problem
Projection type video displays face challenges in maintaining effective cooling when the air filter becomes clogged, which impairs the intake of outside air and disrupts cooling control.
Innovation Solution
Incorporating an air-volume sensor and a control system that adjusts the cooling power based on air volume data, along with optional barometric pressure and temperature sensors, to dynamically manage cooling even when the filter is clogged, using pre-defined control tables for different operational modes and power settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is provided at the air-intake port to remove dust, then dust removal capability is improved, but cooling control reliability deteriorates when the filter becomes clogged
Solution Approach 1:
The air-volume sensor provides feedback on the actual air intake volume to the control means, which adjusts the cooling power accordingly. This closed-loop feedback mechanism ensures that when the filter becomes clogged and air intake decreases, the system automatically reduces cooling power to match the reduced air flow, preventing overheating while maintaining reliable operation.
Solution Approach 2:
The cooling power of the air-cooling means is made dynamic and adjustable rather than fixed. The control means continuously monitors air volume through the air-volume sensor and dynamically adjusts the cooling power to match actual operating conditions, allowing the system to adapt to filter clogging and maintain reliability.
2Illumination intensity
If high-intensity light source is used to improve image brightness, then illumination intensity is improved, but heat generation increases requiring more cooling
Solution Approach 1:
The air-volume sensor provides feedback on actual air intake to the control means, which adjusts cooling power to match the heat generation level. When the light source operates at high intensity generating more heat, the system uses sensor feedback to increase cooling power accordingly, maintaining thermal balance.
Solution Approach 2:
The cooling power parameter is made variable and is changed based on operating conditions. The control means adjusts the cooling power parameter in response to changes in light source intensity and corresponding heat generation, as well as actual air intake volume, to maintain optimal thermal management.
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
Enables continuous and appropriate cooling control even when the filter is clogged, ensuring optimal performance and preventing overheating by adjusting fan power according to air volume, pressure, and temperature data.
Implementation Method 1
an air-cooling means for cooling inside the display by air
Implementation Method 2
an air-volume sensor for detecting a volume of air drawn from the outside-air intake port
Implementation Method 3
a barometric sensor for detecting a barometric pressure
Data Source
AI summary
Barometric-pressure data that a barometric pressure sensor outputs, and an air volume data that an air-volume sensor outputs are input into a system control circuit. The system control circuit is provided with a table storing portion. In the table storing portion, a control table is stored. The control table defines a voltage value to be added to a fan power supply set by a barometric-pressure value and an air-volume value. The voltage value to be added is voltage added to a normally set voltage value, and is set within a range from 0 (zero) V (volt) to 6 V, for example. The normally set voltage value is voltage set based on temperature detected by a temperature sensor, for example. In this case, the voltage value to be added is applied to voltage that is determined by the outside temperature and applied to the fan power supply.