Projection Device Control for Fan-Abnormality Heat Management
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Solution Overview
Problem
Conventional laser DLP projectors face issues with noise and heat dissipation due to fan operation, and reducing driving current to manage heat generation leads to poor luminous efficacy and color distortion.
Innovation Solution
A projection device with an illumination module, optical engine, projection lens, and control circuit that adjusts the driving current of light emitting elements and fans to manage heat and noise, turning off elements or increasing current when fan abnormalities occur or in low brightness mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan rotation speed is increased to dissipate heat, then heat dissipation performance is improved, but noise level increases
Solution Approach 1:
The system performs preliminary detection of fan abnormalities before they cause severe overheating. The control circuit continuously monitors fan status and proactively adjusts light emitting element operation when fan issues are detected, preventing the need for high-speed fan operation and reducing noise while maintaining heat dissipation safety
Solution Approach 2:
The system changes the operating parameters of light emitting elements based on fan status. When fan abnormalities are detected, the control circuit adjusts the driving current of light emitting elements to operate at lower current levels, which generates less heat and reduces the need for high-speed fan operation, thereby reducing noise
2Temperature
If the driving current of laser light source is decreased to reduce heat generation, then heat generation is reduced, but wall plug efficiency decreases and color distortion occurs
Solution Approach 1:
The system divides the light emitting elements into multiple groups and can selectively operate different numbers of elements based on heat dissipation needs. By segmenting the total light output across multiple elements rather than reducing current through a single element, the system maintains efficient operation of active elements while controlling overall heat generation
Solution Approach 2:
The system dynamically adjusts the number of operating light emitting elements and their individual driving currents based on real-time fan status and temperature conditions. This dynamic control allows the system to optimize the balance between heat generation and wall plug efficiency, maintaining high efficiency when possible and reducing heat only when necessary due to fan limitations
3Illumination intensity
If the driving current of light emitting elements is adjusted to maintain brightness, then luminous output is maintained, but heat generation increases when fan is abnormal
Solution Approach 1:
When fan abnormalities are detected, the control circuit segments the light output requirement across fewer light emitting elements operating at optimized current levels rather than all elements at high current. This segmentation maintains total brightness output while reducing peak heat generation from individual elements, preventing overheating under abnormal fan conditions
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 reduces heat generation and noise while maintaining operational temperature and brightness, even in abnormal fan conditions.
Implementation Method 1
the laser light source is, for example, one or more laser light emitting diodes
Implementation Method 2
The light valve is configured to convert the illumination beam into an image beam
Implementation Method 3
fans are mainly used with heat dissipation fins to dissipate the heat generated by the main heating components inside the projector to the air outside the projector
Implementation Method 4
The projection lens is configured to project the image beam from the light valve out of the projection device
Data Source
AI summary
A projection device and a control method thereof. When an abnormality occurs in a fan, M light emitting elements among N light emitting elements are turned off, and a driving current of (N−M) light emitting elements is adjusted to be higher than a preset current, and when the driving current of P light emitting elements among the N light emitting elements is lower than the preset current, at least one of the P light emitting elements is turned off, and the driving current of a remaining portion that are not turned off of the P light emitting elements is adjusted to be higher than the preset current, so that when the fan is abnormal and needs to be turned off, or when the fan needs to be turned off in low noise/low brightness mode, a heat dissipation module may still be used to effectively dissipate heat.