Display Cooling Manifolds and Heat Exchanger for Thermal Management
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Solution Overview
Problem
Electronic displays face challenges in cooling, particularly in outdoor environments with extreme temperatures and high brightness, leading to increased heat generation and noise issues with existing cooling systems, which struggle to efficiently manage thermal gradients and prevent contamination of sensitive components.
Innovation Solution
A cooling system that utilizes a combination of circulating gas and ambient gas, with a cross-flow heat exchanger to transfer heat without mixing, and additional ambient gas flow across the rear surface to cool the backlight, while minimizing noise through fan placement within the heat exchanger and manifolds for even distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If gas is circulated through the display to cool it, then heat removal is improved, but noise emission increases
Solution Approach 1:
A heat exchanger is introduced as an intermediary component between the circulating cooling gas and the ambient environment. The heat exchanger allows thermal energy transfer from the cooling gas to the ambient air without requiring direct mixing of the gases, thereby maintaining effective cooling while enabling noise reduction through isolated fan placement within the heat exchanger structure.
2Temperature
If ambient gas is drawn through the display for cooling, then heat transfer is improved, but contamination of internal components occurs
Solution Approach 1:
The heat exchanger serves as a barrier that prevents direct contact between ambient gas (which may contain contaminants) and the internal components of the display. Thermal energy is transferred across the heat exchanger walls from the circulating cooling gas to the ambient gas, achieving effective heat transfer while blocking contaminant ingress into the display interior.
Solution Approach 2:
The cooling system is segmented into separate gas circulation pathways: a clean circulating gas loop that passes through the display interior for direct cooling of components, and a separate ambient gas pathway that handles heat extraction from the exterior. This segmentation allows each pathway to serve its specific function without compromising the other.
3Device complexity
If a single gas flow path is used for cooling, then system simplicity is maintained, but thermal gradients cause uneven cooling
Solution Approach 1:
The cooling system is divided into multiple independent gas flow paths: a circulating gas pathway that flows through the display interior, an ambient gas pathway that provides external cooling, and a backlight-specific cooling pathway. This segmentation allows each pathway to target specific thermal zones, eliminating thermal gradients and achieving uniform temperature distribution across the entire display.
Solution Approach 2:
Different regions of the display are provided with customized cooling approaches: the front display surface receives cooling from circulating gas, the backlight cavity receives cooling from ambient gas through the heat exchanger, and the rear backlight surface receives direct ambient gas flow. This local quality approach ensures that each thermal zone receives the appropriate cooling intensity and methodology.
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 cools electronic displays by maintaining clean gas circulation and reducing noise emissions, ensuring consistent temperature management across the display and preventing hot spots, thus enhancing performance and reliability in varying environmental conditions.
Implementation Method 1
The ambient gas and the circulating gas may be drawn through a heat exchanger which will allow the heat to transfer from the circulating gas to the ambient gas, preferably without letting the ambient and circulating gases mix with one another.
Implementation Method 2
Circulating gas may be used to remove heat from the front of the image assembly.
Implementation Method 3
An additional flow of ambient gas can be drawn across the rear surface of the image assembly to remove heat from the rear portion of the image assembly.
Data Source
AI summary
A system for cooling an electronic image assembly using ambient gas. The system contains a plurality of channels place behind the electronic image assembly and preferably in conductive thermal communication with the image assembly. Ambient gas is ingested into the display housing and directed to a first manifold which distributes the ambient gas to the plurality of channels. A second manifold preferably collects the ambient gas from the channels after absorbing heat from the electronic image assembly and/or channels. The second manifold then preferably directs the ambient gas towards an exit aperture and out of the display housing. Circulating gas may also be used to cool a front portion of the electronic image assembly. A cross through plate may be used to allow the ambient gas and circulating gas to cross paths without mixing.