Fan Rotation Control for Projection Light Source Cooling
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Solution Overview
Problem
Temperature management of multiple light sources in projection type display apparatuses is challenging, leading to issues like whitening, life property degradation, and brightness degradation due to excessive heat and mutual radiation among light sources.
Innovation Solution
A cooling unit with a fan is disposed on each light source, and a controlling unit adjusts the fan's rotation rate based on the lighting state of the light sources, incorporating sensors for temperature, atmospheric pressure, and installation posture to optimize cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are used to increase brightness, then the projected image brightness is improved, but temperature management becomes difficult and light source degradation occurs
Solution Approach 1:
The invention divides the cooling function into multiple independent cooling fans, each dedicated to a specific light source. This segmentation allows independent control of cooling for each light source, enabling precise temperature management while maintaining high brightness output from multiple light sources.
Solution Approach 2:
The invention implements dynamic control of fan rotation rates based on the lighting state of light sources. The controlling unit adjusts fan speeds in real-time according to which light sources are active, optimizing cooling efficiency and preventing temperature-related degradation while maintaining the brightness benefits of multiple light sources.
2Illumination intensity
If multiple light sources operate simultaneously, then the projected image brightness is improved, but mutual radiation causes whitening and life property degradation
Solution Approach 1:
The invention employs feedback control where the controlling unit receives information about the lighting state of each light source and adjusts fan rotation rates accordingly. This feedback mechanism prevents excessive temperature rise from mutual radiation by intensifying cooling when multiple light sources operate simultaneously, thereby preventing whitening and extending light source life while maintaining high brightness output.
3Ease of operation
If conventional cooling control is used for single light source, then the temperature management is simple, but it cannot handle the complicated conditions of multiple light sources
Solution Approach 1:
The invention creates a universal temperature management system that handles multiple light source configurations through a single controlling unit. This controlling unit integrates information from multiple light source states and coordinates multiple cooling fans, providing adaptability to various operating conditions while maintaining ease of operation through centralized control.
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 enables accurate and reliable temperature management, preventing whitening, life property degradation, and brightness degradation, ensuring high-quality and reliable projection displays.
Implementation Method 1
a cooling unit having a fan is disposed on each of the plural light sources
Data Source
AI summary
A projection type display apparatus includes a plurality of light sources 7a-7d, a display device unit 5, a light-combining unit 3 that combines output light from the plural light sources, a condensing unit 4 that propagates output light from the light-combining unit to the display device unit, and a projecting unit 6 that projects an image by the use of output light from the display device unit. In the projection type display apparatus, cooling units having fans 21a-21d are disposed respectively on the plural light sources, and a controlling unit 31 is provided to control the cooling units. Information regarding the lighting state of the plural light sources is inputted into the controlling unit, and the controlling unit controls a rotation rate of the fans of the cooling units with reference to the information. Concerning a case of temperature management of a plurality of light sources used, an accurate and reliable control is performed; problems such as whitening of the light sources, degradation of life property, blacking, brightness degradation and the like are suppressed, thereby high quality and high reliability are obtained.