Backlight Unit Bottom Cover Slits for Thermal Deformation
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Solution Overview
Problem
Backlight units employing LEDs as light sources face issues with thermal deformation due to heat concentration, leading to component damage and light leakage, which deteriorate the displaying quality of LCD devices.
Innovation Solution
Incorporating a bottom cover with slits formed on its edges, opposite to the printed-circuit-board, to reduce thermal deformation by allowing heat to be partially bypassed and providing extra space for expansion and contraction, thereby preventing damage and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat is transferred to the side surface of the bottom cover, then LED lifespan is prevented from reduction, but the bottom cover is deformed by concentrated heat
Solution Approach 1:
The bottom cover is segmented by forming multiple slits that divide the continuous metal surface into separate sections. This segmentation allows different parts of the bottom cover to expand and contract independently in response to thermal changes, preventing overall deformation while still providing heat transfer pathways.
Solution Approach 2:
The bottom cover is transformed from a solid continuous structure to a porous-like structure with multiple slits. These slits create channels for heat dissipation and provide expansion spaces, allowing the material to accommodate thermal changes without deforming, similar to how porous materials handle stress and strain.
2Temperature
If the bottom cover is formed from metal material, then heat transfer is effective, but the bottom cover easily expands and contracts with heat causing deformation
Solution Approach 1:
The invention explicitly accounts for thermal expansion by designing the bottom cover with slits that provide expansion spaces. These slits allow the metal material to expand and contract along the slit directions when heated, accommodating the natural thermal expansion behavior of metal without causing deformation or damage to the cover structure.
3Reliability
If the side surface of the bottom cover is thermally deformed, then components within the bottom cover can be damaged, but also light leaks from the edge
Solution Approach 1:
The slits are designed in advance to prevent thermal deformation before it occurs. By providing expansion spaces and heat dissipation channels through the slits, the structure preemptively counteracts the thermal forces that would otherwise cause deformation, component damage, and light leakage, maintaining both component integrity and optical performance.
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 effectively minimizes thermal deformation of the bottom cover, preventing component damage and brightness deterioration, thus enhancing the displaying quality of LCD devices.
Implementation Method 1
the bottom cover of a metal material easily expands and contracts with heat
Implementation Method 2
the metal PCB disposed on the inner side surface of the bottom cover transfers heat generated in the plurality of LEDs to the bottom cover
Data Source
AI summary
A backlight unit adapted to prevent light leakage and damage of its internal components due to a thermal deformation is disclosed.The backlight unit includes: a bottom cover with an opened upper surface; a printed-circuit-board disposed on at least one inner side surface of the bottom cover; a plurality of LEDs loaded on the printed-circuit-board; and a plurality of slits formed on at least one edge of the bottom cover opposite to the printed-circuit-board and configured to reduce thermal deformation of the bottom cover.