Thermal-Conductive Reflection Plate for LCD Backlight Heat Dissipation
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Solution Overview
Problem
The thermal problem of the backlight unit in liquid crystal display devices is not effectively addressed by existing technologies, particularly due to low thermal conductivity of reflection plate materials, which limits heat dissipation and increases the risk of thermal damage and cost due to the use of separate materials for different components.
Innovation Solution
A reflection plate and lower plate made of a thermoplastic thermal conductive resin composition with a thermal conductivity of at least 0.35 W/mK, using a combination of thermoplastic resin and ceramic solid, simplify the manufacturing process and enhance heat dissipation without the need for additional radiating devices or special structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a white polyester film is used as reflection plate material, then the manufacturing cost is reduced and ease of manufacture is improved, but the thermal conductivity is low causing heat accumulation and yellowing
Solution Approach 1:
The patent applies composite materials by combining polyester resin with ceramic particles (alumina, silica, or titania) to create a reflection plate material that maintains the ease of manufacturing plastic while achieving enhanced thermal conductivity through the ceramic filler content of 1-10 parts by weight per 100 parts of resin
Solution Approach 2:
The patent changes the material parameters by modifying the resin composition to include specific ceramic particles with defined thermal conductivity properties, adjusting the filler content ratio to optimize both thermal conductivity and reflectivity while maintaining processability
2Use of energy by moving object
If a light source is placed closely with the liquid crystal panel to improve illumination efficiency, then the light use rate is increased, but heat generation increases causing screen smudge and reduced panel life
Solution Approach 1:
The patent converts the harmful heat generated by the light source into a beneficial effect by using the same heat to drive thermal conduction through the reflection plate, which is designed with high thermal conductivity ceramic particles to actively dissipate heat away from the liquid crystal panel while maintaining close proximity for efficient illumination
3Reliability
If separate materials are used for reflection plate and heat sink to optimize individual functions, then the functional performance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies universality by designing the reflection plate to perform multiple functions simultaneously: it reflects light to maintain illumination efficiency, conducts heat away from the light source to prevent panel damage, and provides structural support. This multi-functional design eliminates the need for separate heat sink components, reducing device complexity and manufacturing cost
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 solution effectively addresses the thermal issue, improving the durability of liquid crystal display devices by enhancing thermal conductivity, mechanical strength, and reflectivity, while reducing manufacturing complexity and costs.
Implementation Method 1
a reflection plate for a backlight unit of a liquid crystal display device, made of a thermoplastic thermal conductive resin composition having a thermal conductivity of at least 0.35 W/mK
Implementation Method 2
a reflection plate positioned at a lower portion of a lamp of the backlight unit for reflecting a light coming out of the lamp
Data Source
AI summary
The present invention relates to a reflection plate for a backlight unit in a liquid crystal display device, and more particularly, to a reflection plate for a backlight unit in a liquid crystal display device, which is made of a thermoplastic thermal conductive resin composition having a thermal conductivity of at least 0.35 W/mK, thereby effectively solving the thermal problem of the backlight unit, and having excellent properties such as shock resistance, heat resistance, mechanical strength, and the like, as well as having excellent reflectivity, thereby improving the durability of the liquid crystal display device.Furthermore, the present invention relates to a backlight unit of a liquid crystal display device, comprising a reflection plate positioned at a lower portion of a lamp of the backlight unit for reflecting the light coming out of the lamp, a supporting rod for the lamp, and a lower plate functioning as a heat sink, wherein the reflection plate and the lower plate are made of the same material, thereby effectively solving the thermal problem of the backlight unit, and simplifying the manufacturing process.