Blower Arrangement for Liquid Crystal Panel Cooling
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Solution Overview
Problem
The existing cooling systems in projection-type display devices, particularly in 3LCD systems, face inefficiencies due to narrow cooling duct widths, longer flow paths, and limited fan arrangements, leading to reduced cooling efficiency and increased pressure loss, which cannot effectively manage the temperature of liquid crystal panels and optical components.
Innovation Solution
The implementation of three blowers arranged side by side along a direction opposite to the projection lens, with their rotation axes aligned with the facing liquid crystal panels, to enhance cooling efficiency by widening the cooling duct width and shortening the flow path length, and using blower fans with orthogonal intake and outlet directions to improve airflow and reduce pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fans are arranged side by side on the short side of the rectangular optical layout, then the cooling system can be compact, but the flow path width is narrowed and flow path length increases, reducing cooling efficiency
Solution Approach 1:
The patent changes the arrangement dimension of the fans from the short side (width direction) to the long side (length direction) of the rectangular optical layout. This dimensional repositioning allows the cooling air to flow through wider ducts with shorter paths, directly resolving the contradiction between compact arrangement and cooling efficiency by exploiting the available space in the length direction.
2Area of stationary object
If the fan arrangement angle is changed to increase intake area, then the fan intake area increases, but pressure loss increases due to angled air guiding
Solution Approach 1:
Instead of angling the fan intake to increase area (conventional approach), the patent inverts the approach by keeping the fan intake perpendicular to the optical axis and increasing the duct cross-sectional area in the direction perpendicular to the optical axis. This inversion eliminates the need for angled air guiding, thereby reducing pressure loss while maintaining large intake area.
3Device complexity
If only two fans are used to cool three liquid crystal panels, then the device structure is simplified, but cooling efficiency is insufficient
Solution Approach 1:
The patent applies local quality by assigning dedicated cooling resources to specific thermal zones. Each of the three liquid crystal panels has its own dedicated fan and cooling duct, allowing each panel to be cooled independently and efficiently according to its local heat generation characteristics, rather than using a shared cooling system that would compromise overall cooling efficiency.
4Volume of moving object
If the flow path width is narrowed to fit compact arrangements, then the device size is reduced, but cooling efficiency decreases
Solution Approach 1:
The patent resolves the volume-efficiency contradiction by redirecting the cooling airflow path to utilize the length direction of the rectangular optical layout rather than the width direction. This allows the cooling ducts to maintain large cross-sectional areas for efficient airflow while the overall device footprint remains compact, as the extended cooling path is accommodated within the existing length dimension.
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 configuration achieves higher cooling efficiency, extends the life cycle of liquid crystal panels, reduces noise, simplifies production, and lowers costs by ensuring efficient heat management and reducing the number of components and fan rotational speeds.
Implementation Method 1
cooling air blown out from a blower fan, which is generally arranged around an illumination optical system, is guided to liquid crystal panels and optical components using a cooling duct
Implementation Method 2
the optical component temperature rise due to the absorption of light is generated
Implementation Method 3
the electronic component generates heat due to electrical resistance
Data Source
AI summary
An electronic device includes blowers. Blowers cool liquid crystal panels for light modulation mounted on illumination optical system for outputting light to a projection lens, respectively, and are disposed on the opposite side to the side where the projection lens of three liquid crystal panels is disposed and are arranged side by side along a first direction facing two liquid crystal panels of three liquid crystal panels.