Projection Display Cooling Fan Control via Air Volume Sensor
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Solution Overview
Problem
Projection type video displays face challenges in maintaining appropriate cooling control due to clogged filters at the air-intake ports, which hinder effective heat dissipation from high-intensity light sources and optical components.
Innovation Solution
Incorporating an air-volume sensor and a warning-outputting means to detect filter clogging based on air-volume data, along with a barometric pressure sensor to adjust warning outputs and fan control conditions, ensuring users are informed of inadequate cooling and enabling appropriate control measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is provided at the air-intake port to remove dust, then the cooling performance is improved, but the device complexity increases and the filter may become clogged
Solution Approach 1:
The patent implements a feedback mechanism where the air-volume sensor continuously monitors air flow through the filter, and the control unit receives this information to determine filter clogging status. This allows the system to detect when the filter requires maintenance without requiring complex manual inspection procedures.
Solution Approach 2:
The system performs self-diagnosis by automatically detecting filter clogging conditions through the air-volume sensor and control unit, eliminating the need for users to manually inspect the filter. The system serves itself by identifying maintenance needs and providing warnings to users.
2Reliability
If the air-volume sensor detects filter clogging, then the reliability of cooling control is improved, but the device complexity increases
Solution Approach 1:
The air-volume sensor provides continuous feedback on air flow conditions to the control unit, enabling the system to automatically adjust cooling operations or alert users to filter maintenance needs, thereby improving cooling control reliability.
Solution Approach 2:
The air-volume sensor acts as an intermediary between the physical air flow and the control system, translating physical conditions into electrical signals that the control unit can process to make intelligent cooling control decisions.
3Reliability
If the filter is clogged, then the cooling performance deteriorates, but the user is not informed without additional sensors
Solution Approach 1:
The system uses the air-volume sensor to provide feedback on filter status to the control unit, which then generates appropriate warnings to inform users when the filter is clogged and cooling performance has deteriorated.
Solution Approach 2:
The control unit serves as an intermediary that processes air-volume sensor data and translates it into user-friendly warning messages, ensuring that users are informed about filter status without requiring complex direct displays.
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
The solution effectively informs users of filter clogging, allowing for proper cooling control adjustments, thereby maintaining optimal operating conditions for the video display.
Implementation Method 1
an air-volume sensor for detecting a volume of air drawn from the outside-air intake port
Implementation Method 2
a barometric pressure sensor for detecting a barometric pressure
Implementation Method 3
an intake and exhaust are performed by rotating a cooling fan by a motor so as to release the heat to outside the video display
Implementation Method 4
light emitted from a light source is modulated by a light valve such as a liquid crystal panel, etc.
Data Source
AI summary
Data of a barometric pressure that a barometric pressure sensor outputs, and data of an air volume 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 is formed of a plus supplied-voltage value to fan power set by a barometric pressure value and an air-volume value, and a warning instruction. In a case that the warning instruction is selected based on the barometric pressure value and the air-volume value, the system control circuit turns on a warning-use LED so as to inform a user that a filter is clogged.