LED Backlight Heat Sink for LCD Luminous Efficiency

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Solution Overview

Problem

In liquid crystal display devices with LED backlights, the heat generated by LED chips leads to reduced luminous efficiency and shorter lifespan due to temperature rises, necessitating effective heat management solutions.

Innovation Solution

The integration of a thermally conductive member connected to a mounting board, which is in turn connected to a heat sink member, to efficiently dissipate heat away from the LED light sources and their surroundings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If LED light sources are used as backlight, then luminous efficiency and environmental compatibility are improved, but temperature rise occurs leading to reduced lifespan and luminous efficiency

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlifespan of LED light source

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent extracts the heat dissipation function from the mounting board by introducing a dedicated heat sink member connected through a thermally conductive member. This separates the light emission function (LED) from the heat management function (heat sink), allowing the LED to operate at lower temperatures while maintaining high luminous efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a thermally conductive member as an intermediary between the mounting board and heat sink member. This mediator efficiently transfers heat from the LED mounting area to the heat sink, reducing the temperature rise that would otherwise degrade LED lifespan and performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If multiple LED light sources are arranged to increase brightness, then display brightness is improved, but heat generation increases leading to greater temperature rise

Engineering Contradiction:

Improvedisplay brightnessVSAvoidtemperature of LED and peripheral regions

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent segments the heat dissipation path by providing individual mounting board regions for each LED light source, with each region connected to the heat sink through thermally conductive members. This segmented approach allows heat from multiple LEDs to be independently managed and efficiently transferred to the heat sink, enabling high brightness without excessive temperature rise.

Inventive Principle:

Principle #1Segmentation

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 effectively reduces temperature rises and prolongs the lifespan of LED light sources while improving luminous efficiency by ensuring efficient heat dissipation.

Implementation Method 1

a thermally conductive member connected to the mounting board (21), to efficiently dissipate heat away from the LED light sources and their surroundings

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS7545461B2Liquid crystal display device

Publication Date: 2009.06.09 KYOCERA CORP

AI summary

A liquid crystal display device comprising a liquid crystal display panel, a backlight and a heat sink member is disclosed. The backlight comprises a light-guiding plate disposed on one principal surface side of the liquid crystal display panel, LED light sources disposed on an end surface of the light-guiding plate, a mounting board for mounting the LED light sources thereon and a thermally conductive member connected to the mounting board. The heat sink member is connected to the mounting board through the thermally conductive member.