LED Backlight Lamp Holder with Exposed Source for Heat Dissipation
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Solution Overview
Problem
Liquid crystal display (LCD) devices using light emitting diodes (LEDs) face challenges in efficiently dissipating heat generated from the LED unit, as the heat is often trapped within the lamp holder and not easily dissipated to the outside.
Innovation Solution
A backlight unit design featuring a light guiding plate, a reflecting sheet with specific portions to expose LEDs, and projections to enhance light reflection and dissipation, allowing for improved heat dissipation and light efficiency by not enclosing the LEDs, thus preventing heat entrapment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the lamp holder encloses the LED unit to reduce light loss, then light efficiency is improved, but heat dissipation becomes difficult as heat is trapped within the holder
Solution Approach 1:
The lamp holder is divided into distinct functional regions: a light reflective portion that encloses the LED unit to reflect light toward the light guiding plate, and a separate light source exposing portion that opens toward the LED unit to allow heat dissipation. This segmentation allows the structure to simultaneously achieve light efficiency through reflection while enabling heat escape through the opening portion.
Solution Approach 2:
Different portions of the lamp holder are given different functional qualities: the light reflective portion has high reflectivity to maximize light efficiency, while the light source exposing portion has openness to facilitate heat dissipation. This local differentiation of structural properties allows the single lamp holder component to address both light efficiency and heat dissipation requirements.
2Illumination intensity
If the lamp holder encloses the LED unit to prevent light loss, then light output is improved, but heat accumulation occurs within the holder
Solution Approach 1:
The lamp holder is segmented into a light reflective portion that maintains enclosure for light output and a light source exposing portion that provides opening for heat dissipation. This segmentation resolves the contradiction by showing that complete enclosure is not necessary - selective enclosure for light reflection while maintaining openness for heat escape achieves both goals.
Solution Approach 2:
The harmful function of heat accumulation is addressed by extracting the heat dissipation function from the enclosed space. The light source exposing portion extracts the heat escape pathway from the otherwise enclosed lamp holder structure, allowing heat to be removed while maintaining the light-reflecting enclosure.
3Use of energy by moving object
If a reflecting sheet is added to reduce light loss, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The lamp holder integrates both light reflection and heat dissipation functions into a single component structure. The light reflective portion and light source exposing portion are combined in one lamp holder assembly, eliminating the need for separate reflecting sheets and reducing overall device complexity while maintaining high light efficiency.
Solution Approach 2:
The lamp holder is designed as a multi-functional component that simultaneously performs light reflection, light guidance, and heat dissipation functions. By making the lamp holder universal rather than adding separate components for each function, the design improves light efficiency without proportionally increasing device complexity.
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 design effectively dissipates heat from the LED unit while maintaining high light efficiency by ensuring that heat can escape through the chassis, improving the overall performance of the LCD device.
Implementation Method 1
a reflecting sheet comprising a first portion facing the light reflective surface of the light guiding plate
Implementation Method 2
a light guiding plate comprising a light exiting surface, a light reflective surface, and a light incident surface
Data Source
AI summary
A backlight unit for use in a liquid crystal display comprises a light guiding plate comprising a light exiting surface, a light reflective surface, and a light incident surface, a light source unit comprising a substrate and a light source disposed on the substrate, wherein the light source unit is disposed to face the light incident surface of the light guiding plate, and a reflecting sheet comprising a first portion facing the light reflective surface of the light guiding plate, a second portion facing the light exiting surface of the light guiding plate, and a third portion connecting the first and the second portions, wherein the third portion comprises light source exposing parts.