Backlight Module Heat Dispersing Member and Liquid Crystal Display
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Solution Overview
Problem
Conventional liquid crystal display devices with metallic bottom trays are costly and heavy due to the use of alloy or metallic materials, which are necessary for heat transmission and mechanical strength but increase the weight and expense of the backlight module.
Innovation Solution
A backlight module design featuring a hollow bottom tray made of plastic or a suitable material, combined with a heat dispersing plate that attaches to the light source, reducing material usage and weight while maintaining effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If alloy or metallic material is used for the bottom tray, then heat transmission and mechanical strength are improved, but cost and weight increase
Solution Approach 1:
The bottom tray is divided into two functional parts: an upper heat transmission portion made of metal (aluminum or aluminum alloy) and a lower support portion made of plastic. This segmentation allows each material to perform its optimal function - metal for heat dissipation where needed, plastic for structural support where weight reduction is beneficial.
Solution Approach 2:
Metal material is applied locally only to the upper portion of the bottom tray where heat transmission is critical, rather than using metal throughout the entire tray. This localized application of material properties reduces overall weight and cost while maintaining necessary thermal performance in the heat-generating region.
2Strength
If alloy or metallic material is used for the bottom tray, then mechanical strength is improved, but cost increases
Solution Approach 1:
The bottom tray is segmented into metal and plastic portions, with the plastic lower portion providing sufficient structural support at lower cost. The metal upper portion is used only where strength is critical for heat transmission, reducing overall material cost while maintaining necessary mechanical properties.
Solution Approach 2:
The bottom tray uses a composite structure combining metal and plastic materials. This composite approach leverages the high strength-to-weight ratio of metal where needed and the cost-effectiveness and ease of manufacturing of plastic for the remaining structure, achieving optimal balance between strength and cost.
3Weight of stationary object
If hollow bottom tray with plastic material is used, then cost and weight are reduced, but heat transmission capability may be compromised
Solution Approach 1:
The bottom tray is segmented with the upper portion made of heat-conductive metal and the lower portion made of plastic. This segmentation ensures that heat transmission occurs through the metal portion where it is most needed, while the plastic portion provides weight reduction and structural support.
Solution Approach 2:
The metal upper portion acts as an intermediary heat transmission layer between the backlight module and the plastic lower portion. It efficiently conducts heat away from the light source and transfers it to the plastic structure, which then dissipates heat to the surrounding environment, combining the advantages of both materials.
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 solution reduces the cost and weight of the backlight module by using a lightweight plastic tray and a heat dispersing plate that efficiently manages heat generated by the light source, maintaining the module's performance and reducing material costs.
Implementation Method 1
a heat dispersing member disposed along the light source
Data Source
AI summary
An exemplary backlight module (200) used for liquid crystal display device (20) includes a first frame (261), a light source (240), a heat dispersing member (280) disposed along the light source, and a second frame (270) defining a window at a middle portion thereof. The second frame cooperative with the first frame to form a space receiving the light source and the heat dispersing member therein.