Projection Display Air Deflector Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional projectors face issues with dust and dirt adhesion on the imager due to air turbulence around step portions, leading to reduced illuminance and image discoloration, especially with increased heat generation from high-luminance light sources.
Innovation Solution
Incorporating an air deflector within the cooling section to direct cooling air towards the polarizer, minimizing turbulence and dust adhesion on the imager, even with step portions, by using inclined pieces on the brackets supporting the light modulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air flow rate is increased to cool the light modulator and polarizers, then cooling efficiency is improved, but air turbulence around step portions increases causing dust adhesion on the imager
Solution Approach 1:
A guide member is introduced as an intermediary component between the cooling air flow and the step portion. This guide member redirects the cooling air flow to bypass the step portion, preventing dust adhesion while maintaining effective cooling of the light modulator and polarizer. The guide member acts as a mediator that resolves the conflict between cooling efficiency and dust prevention.
Solution Approach 2:
The cooling air flow is redirected along a different spatial path using the guide member. Instead of flowing directly past the step portion where dust adhesion occurs, the air is guided along an alternative trajectory that maintains cooling effectiveness while avoiding the problematic region. This dimensional redirection of the airflow path resolves the contradiction.
2Strength
If frame thickness is increased to provide structural support, then mechanical strength is improved, but step portion is formed causing air turbulence and dust stagnation
Solution Approach 1:
The guide member serves as an intermediary that bridges the structural frame and the cooling air flow. It is mounted on the frame structure and extends to guide the air flow around the step portion, allowing the frame to maintain its structural integrity while the guide member prevents the formation of turbulent eddies that would cause dust adhesion.
3Illumination intensity
If light source luminance is increased to improve image brightness, then illumination intensity is improved, but heat generation increases requiring higher cooling air flow rate
Solution Approach 1:
The guide member acts as an intermediary that enables the system to handle higher heat loads from high-luminance light sources. By efficiently directing cooling air flow and preventing dust adhesion that would degrade optical performance, the guide member allows the system to operate at higher luminance levels without compromising thermal management or image quality.
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 design enhances cooling efficiency, reduces dust adhesion, and prevents image deterioration by ensuring efficient airflow around the light modulators and polarizers, as demonstrated by temperature measurements and dust environment tests.
Implementation Method 1
an air deflector for deflecting the air flowing in the space between the light modulator and the polarizer toward the polarizer
Implementation Method 2
a cooling section for allowing cooling air to flow in a space between the light modulator and the polarizer
Data Source
AI summary
A projection display device includes: a light modulator for modulating light from a light source; a polarizer disposed at a position facing the light modulator; a cooling section for allowing an air to flow in a space between the light modulator and the polarizer; and an air deflector for deflecting the air flowing in the space between the light modulator and the polarizer toward the polarizer.