Backlight Module With Liquid Phase-Change Heat Dissipation
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Solution Overview
Problem
The increasing power consumption in backlight modules, particularly in car display devices, leads to significant heat dissipation issues, restricting their use environment and reducing reliability.
Innovation Solution
A backlight module with a frame body containing an accommodation chamber and a heat dissipation enhancement layer filled with a liquid heat dissipation agent that converts between liquid and gas states to absorb and dissipate heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the power consumption of the backlight module is increased to meet brightness demands in car display devices, then the brightness performance is improved, but heat dissipation issues worsen and reliability decreases
Solution Approach 1:
The patent utilizes phase transition of the liquid heat dissipation agent (evaporation and condensation) to create a thermosyphon effect. The liquid absorbs heat at the evaporation end near the light source, converts to gas, rises to the condensation end, releases heat, and returns as liquid through capillary action. This phase transition mechanism enables efficient passive heat dissipation without additional power consumption, resolving the contradiction between maintaining high brightness and ensuring reliability.
Solution Approach 2:
The patent employs a thermosyphon system utilizing fluid dynamics and pressure differentials created by phase transitions. The vapor pressure gradient drives the circulation of the liquid heat dissipation agent through the porous structure, enabling continuous heat transport from the light source to the heat dissipation fins without mechanical pumps or external power, thus maintaining reliability while supporting high brightness operation.
2Illumination intensity
If the power consumption of the backlight module is increased to meet brightness demands, then the brightness performance is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The liquid heat dissipation agent undergoes phase transition from liquid to gas at the evaporation end (near the light source) absorbing latent heat of vaporization, effectively cooling the high-temperature region. The vapor then travels to the condensation end where it releases latent heat of condensation to the environment through heat dissipation fins. This phase change mechanism provides high heat transfer efficiency without requiring additional power, enabling the system to maintain high brightness while effectively managing heat dissipation.
Solution Approach 2:
The patent utilizes a porous structure (such as porous ceramic or metal foam) as the heat dissipation medium. The porous structure provides large surface area for heat exchange, capillary channels for liquid circulation, and evaporation/condensation zones. The capillary forces in the porous material drive the liquid heat dissipation agent through the structure, enabling efficient heat transfer from the light source to the environment without external power input, thus resolving the heat dissipation difficulty associated with high brightness operation.
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 liquid heat dissipation agent facilitates rapid heat dissipation, improving the module's operational environment and reliability by allowing repeated use and enhancing heat conduction channels.
Implementation Method 1
a liquid heat dissipation agent, which is heated to convert at least partially from the liquid state to the gas state to quickly absorb heat
Implementation Method 2
The liquid heat dissipation agent permeates the liquid absorption core, and is heated to convert at least partially from the liquid state to the gas state
Implementation Method 3
The heat dissipation agent, after cooled, at least partially converts from the gas state to the liquid state such that the dissipation agent can be used repeatedly for heat dissipation
Implementation Method 4
the heat dissipation enhancement layer comprises a liquid absorption core, the liquid absorption core is a capillary or porous structure, and the liquid heat dissipation agent permeates the liquid absorption core
Data Source
AI summary
An embodiment of the present application discloses a backlight module and a display device. The backlight module device: a frame body, wherein the frame body includes at least one accommodation chamber; a backlight source disposed on a side of the accommodation chamber; and a heat dissipation enhancement layer disposed in the accommodation chamber, wherein heat dissipation enhancement layer including a liquid heat dissipation agent. The embodiment of the present application by the heat dissipation enhancement layer including the liquid heat dissipation agent, can accelerate heat dissipation to mitigate difficulty to heat dissipation due to high power consumption such that a range of environments of use of the backlight module is improved.