Liquid Cooling for LED Backlight Heat Dissipation

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Solution Overview

Problem

Conventional air-cooled cooling devices for LED backlights in liquid crystal displays generate noise and are insufficient for cooling larger panels, leading to display defects like color unevenness and malfunctions due to inadequate heat dissipation.

Innovation Solution

A liquid cooling system with a pipe and coolant is employed, where the coolant flows through the pipe, which is in contact with the LED backlight, and a thermal conductor may be used between the LED and the cooling device to enhance heat transfer and reduce power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If air-cooled cooling device with cooling fan is used, then heat radiation is achieved, but noise is generated and oscillation occurs

Engineering Contradiction:

Improveheat radiation capabilityVSAvoidnoise and oscillation

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical cooling fan system with a liquid circulation cooling system. Instead of using air flow generated by a rotating fan, the invention uses a pump to circulate coolant through contact with the LED backlight, thereby eliminating mechanical vibration and noise while achieving heat radiation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs hydraulic cooling by circulating liquid coolant through a cooling device that contacts the LED backlight. The coolant absorbs heat through thermal conduction and is pumped through the system, providing efficient heat radiation without the noise and oscillation problems of air-cooled fan systems.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Temperature

If air-cooled cooling device is used, then cooling is provided, but cooling capability is insufficient for larger panels

Engineering Contradiction:

Improvecooling capabilityVSAvoidpanel size

Core Design Contradiction:

TemperatureVSArea of stationary object

Solution Approach 1:

The liquid circulation cooling system provides superior heat transfer capability compared to air cooling. The coolant directly contacts or closely approaches the LED backlight, enabling efficient heat absorption even from large-area panels. The hydraulic system can be scaled to match larger panel areas while maintaining adequate cooling performance.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The patent introduces coolant as an intermediary substance between the heat source (LED backlight) and the external environment. This intermediary enables more efficient heat transfer from the backlight to the cooling system, providing adequate cooling capability for larger panels where direct air cooling becomes insufficient.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Illumination intensity

If LED backlight is used, then color reproduction area is widened, but heat generation increases

Engineering Contradiction:

Improvecolor reproduction areaVSAvoidheat generation

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The liquid circulation cooling system efficiently removes heat generated by the LED backlight. The coolant absorbs thermal energy through direct or indirect contact, preventing heat accumulation that would otherwise cause display defects. This enables the LED backlight to operate at high efficiency with maintained color reproduction performance.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The cooling system provides thermal feedback control by continuously circulating coolant to maintain optimal operating temperature of the LED backlight. This prevents temperature-related performance degradation and ensures stable color reproduction over time, addressing the heat generation issue while preserving LED advantages.

Inventive Principle:

Principle #23Feedback

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 cooling system efficiently cools the LED backlight, preventing display defects by effectively dissipating heat and reducing power consumption, while the thermal conductor aids in faster cooling and uniform voltage application.

Implementation Method 1

The cooling device includes a pipe and a coolant flowing through the pipe. The backlight and the cooling device are in contact with each other

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

a thermal conductor may be used between the LED and the cooling device to enhance heat transfer

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS8564741B2Display device

Publication Date: 2013.10.22 SEMICON ENERGY LAB CO LTD

AI summary

A cooling device is provided, where an LED backlight can be efficiently cooled in order to suppress display unevenness caused by heat generated from the LED backlight. In addition, a display device including the cooling device is also provided. A display device is provided, where the LED backlight can be cooled by arranging a coolant pipe on a back surface side of the LED backlight and supplying a coolant to a coolant pipe. Further, a display device is provided, where cooling efficiency of the LED backlight can be more improved by arranging a thermal conductor between the LED backlight and the cooling device.