Heat Spreader for LCD TV LED Light Bar Thermal Management
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Solution Overview
Problem
Current heat dissipation systems in liquid crystal televisions, particularly those using side-edge lighting, face challenges with excessive temperature at the light incidence side due to limited heat dissipation capabilities of traditional aluminum extrusions, which can lead to increased thickness and reduced heat dissipation efficiency.
Innovation Solution
A heat dissipation system comprising a shaped heat-dissipating member with an adhesive-mounted LED light bar, a heat spreader with a hollow interior evacuated and filled with coolant, and heat-dissipating fins and fans, where the heat spreader functions as a core heat transfer medium to efficiently dissipate heat from the LED light bar, reducing temperature gradients and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aluminum extrusions are used for heat dissipation with natural heat transfer, then the structure is simple, but the heat dissipation capability is very limited and cannot meet the needs of new types of liquid crystal televisions
Solution Approach 1:
The patent combines multiple heat dissipation mechanisms into a single integrated system: aluminum extrusions for natural convection, heat pipes for phase-change heat transfer, and fan-driven forced convection, thereby achieving high heat dissipation capability while maintaining structural feasibility
Solution Approach 2:
Heat pipes are introduced as intermediary components between the LED light bar and the aluminum extrusions, using phase-change mechanisms to efficiently transfer heat from the light incident side to the heat dissipation fins, thereby overcoming the limited heat dissipation capability of natural convection alone
2Reliability
If the area of aluminum extrusion is enlarged to increase heat dissipation performance, then heat dissipation area increases, but the thickness of the lower portion of the liquid crystal television increases
Solution Approach 1:
The patent extends the heat dissipation structure in the vertical dimension by adding heat pipes that conduct heat upward from the LED light bar to elevated heat dissipation fins, allowing heat dissipation area expansion without increasing the horizontal thickness of the lower portion
Solution Approach 2:
The heat pipe structure creates multiple heat transfer pathways from the LED light bar to distributed heat dissipation fins, effectively multiplying the heat dissipation capacity without proportionally increasing the base thickness
3Area of stationary object
If the area of aluminum extrusion is enlarged, then heat dissipation area increases, but the temperature gradient increases meaning the temperature near the LED light bar becomes very high
Solution Approach 1:
Heat pipes serve as intermediary heat transfer components that efficiently conduct heat away from the LED light bar before it can create excessive localized temperatures, distributing thermal energy to multiple heat dissipation fins and reducing the temperature gradient
Solution Approach 2:
The patent replaces reliance on natural convection mechanics with phase-change heat pipe mechanics and forced convection, achieving more uniform heat distribution and reduced temperature gradients across the heat dissipation structure
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
The system effectively reduces temperature gradients and enhances heat dissipation efficiency, preventing LED light bar damage and enabling thinner liquid crystal television designs by utilizing a high thermal conductivity heat spreader in combination with fins and fans.
Implementation Method 1
a heat spreader with a hollow interior evacuated and filled with coolant... functions as a core heat transfer medium to efficiently dissipate heat from the LED light bar, reducing temperature gradients
Implementation Method 2
a heat spreader with a hollow interior evacuated and filled with coolant
Implementation Method 3
heat-dissipating fins and fans, where the heat spreader functions as a core heat transfer medium to efficiently dissipate heat
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention provides a heat dissipation system for a liquid crystal television, and a liquid crystal television. By adhering a highly thermally conductive temperature equalizing plate (4) onto a heat dissipation profile (1), providing a heat dissipation fin (5) and fans (6), and using the temperature equalizing plate (4) as the core heat conducting medium of the entire heat dissipation system, the heat dissipation system for a liquid crystal television can greatly reduce the temperature gradient, and quickly and efficiently dissipate a large amount of heat generating by an LED lamp strip (2), to prevent the LED lamp strip (2) from being burnt down due to over high temperature, or the service life of the LED lamp strip (2) from being sharply shortened. In addition, due to the temperature equalizing plate (4), the size of the heat dissipation profile (1) can be reduced, and thus, it is favorable for the thinning of liquid crystal televisions.