LED Housing Thermal Dissipation for LCD Backlight
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Solution Overview
Problem
Liquid crystal display devices with LED backlight units suffer from ineffective heat dissipation, leading to increased temperature and reduced brightness of LEDs, which deteriorates display quality.
Innovation Solution
The design includes an LED housing with a metallic material of high thermal conductance, an 'L'-shaped or plate-shaped structure, and an enlarged contact area between the LED PCB and housing to facilitate rapid heat dissipation, using thermal pads and adhesives for enhanced heat transfer to the exterior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If LED backlight unit is used, then power consumption is reduced and reliability is improved, but heat dissipation becomes ineffective leading to temperature increase and brightness reduction
Solution Approach 1:
The patent extracts the heat dissipation function from the conventional integrated backlight structure by introducing a separate metallic heat dissipation plate beneath the LED assembly. This plate is thermally coupled to the LED PCB through thermal pads, effectively separating the light emission function from the heat management function, allowing independent optimization of both.
Solution Approach 2:
The patent introduces thermal pads as intermediary thermal interface materials between the LED PCB and the metallic heat dissipation plate. These thermal pads serve as a mediator that enhances heat transfer from the LED mounting area to the heat dissipation plate, solving the thermal interface resistance problem in conventional designs.
2Illumination intensity
If LED operating time and brightness are increased, then light output is improved, but temperature increases and brightness is reduced due to poor heat dissipation
Solution Approach 1:
The patent converts the harmful heat generated by high-brightness LED operation into a manageable thermal flow by directing it through a dedicated heat dissipation pathway. The metallic plate acts as a heat sink that captures and disperses the waste heat, allowing the LED to operate at high brightness levels without compromising reliability or lifetime.
3Device complexity
If conventional backlight structure is used, then device simplicity is maintained, but heat dissipation efficiency is insufficient
Solution Approach 1:
The metallic plate serves multiple functions simultaneously: it acts as a heat dissipation plate, a structural support element, and a mounting surface for the LED assembly. This multi-functionality approach adds minimal structural complexity while significantly improving heat dissipation efficiency, as the same component performs both thermal and mechanical roles.
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 dissipates heat from LEDs, minimizing temperature increases and maintaining brightness and lifetime, thereby improving display quality.
Implementation Method 1
an LED housing contacting the LED PCB; a bottom frame under the reflecting plate, the bottom frame including a horizontal plate contacting the reflecting plate and a sidewall perpendicular to the horizontal plate, the sidewall contacting the LED housing
Data Source
AI summary
A liquid crystal display device includes: a main frame having a rectangular ring shape; a reflecting plate on the main frame; a light guide plate on the reflecting plate; a light emitting diode (LED) assembly along at least one side of the main frame, the LED assembly having a plurality of LEDs and an LED printed circuit board (PCB), the LED PCB including a first portion having the plurality of LEDs thereon and a second portion perpendicular to the first portion; an LED housing contacting the LED PCB; a plurality of optical sheets on the light guide plate; a liquid crystal panel on the plurality of optical sheets; a bottom frame under the reflecting plate, the bottom frame including a horizontal plate contacting the reflecting plate and a sidewall perpendicular to the horizontal plate, the sidewall contacting the LED housing; and a top frame covering a front edge portion of the liquid crystal panel, the top frame, the main frame and the bottom frame coupled to each other.