Chassis Bottom Wall Heat Dissipation for Display Panels

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Solution Overview

Problem

The chassis of existing liquid crystal display devices lacks sufficient heat radiation properties, leading to unstable operation and potential damage to the display panel, especially when used in digital signage applications exposed to sunlight, where high luminance is required.

Innovation Solution

A display device configuration with a backlight unit featuring a box-shaped chassis having a bottom wall made of a material with a higher thermal expansion coefficient than the bezel and contact parts, which are made of materials with identical thermal expansion coefficients, to enhance heat radiation while preventing distortion and external light entry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the chassis is made of a single material to simplify structure, then manufacturing is easier, but heat radiation property is insufficient

Engineering Contradiction:

Improvechassis manufacturing simplicityVSAvoidheat radiation property

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The chassis is divided into two distinct parts: a bottom wall made of aluminum alloy for heat radiation, and side walls made of cold-rolled copper plate for structural strength and light blocking. This segmentation allows each part to be optimized for its specific function, resolving the contradiction between manufacturing simplicity and heat radiation performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different materials are assigned to different locations of the chassis based on functional requirements. The bottom wall uses aluminum alloy with high thermal conductivity for heat dissipation, while the side walls use cold-rolled copper plate for mechanical strength and light blocking. This local differentiation resolves the contradiction by providing appropriate material properties where needed.

Inventive Principle:

Principle #3Local quality

2Strength

If the chassis uses a single material for structural integrity, then strength is maintained, but heat dissipation becomes insufficient causing unstable operation

Engineering Contradiction:

Improvechassis structural strengthVSAvoidoperation stability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The chassis structure is segmented into functional zones: the bottom wall made of aluminum alloy handles heat dissipation from light sources, while the side walls made of cold-rolled copper plate provide structural strength and light blocking. This segmentation enables both strength and reliability requirements to be met simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The chassis employs a composite construction using two different materials (aluminum alloy and cold-rolled copper plate) joined together. This composite approach allows the structure to exhibit both the mechanical strength of copper and the thermal conductivity of aluminum, resolving the contradiction between strength and heat dissipation.

Inventive Principle:

Principle #40Composite materials

3Illumination intensity

If high luminance is used for outdoor digital signage, then visibility improves, but heat generation increases causing potential damage to the display panel

Engineering Contradiction:

Improveluminance levelVSAvoidheat damage to display panel

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The heat radiation function is extracted from the general chassis structure and assigned to the aluminum alloy bottom wall, which is specifically positioned to contact the light sources. This extraction allows high luminance operation while isolating the heat management function to a dedicated component.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The aluminum alloy bottom wall acts as an intermediary between the light sources and the display panel, providing a thermal conduction path that redirects heat away from the display panel. This intermediary component enables high luminance operation without transmitting harmful heat to the panel.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 increases the heat radiation property of the backlight unit, preventing damage to the display panel and maintaining high display quality by efficiently dissipating heat and preventing uneven luminance and external light interference.

Implementation Method 1

the bottom wall of the chassis being made of a material having a thermal expansion coefficient higher than those of the bezel and the contact part

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

increase a heat radiation property of a backlight unit

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 3

the bezel and a contact part of the chassis, which contact part is in contact with the display panel, being made of materials having identical thermal expansion coefficients

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS8858008B2Display device

Publication Date: 2014.10.14 SHARP KK

AI summary

A display panel (10) of a display device (1) is sandwiched between a chassis (31) and a bezel (20). The bezel (20) and a contact part of the chassis (31), which contact part is in contact with the display panel (10), are made of materials having identical thermal expansion coefficients. A bottom wall (32) of the chassis (31) is made of a material having a thermal expansion coefficient higher than those of the bezel (20) and the contact part.