Backlight Unit Heat Dissipation and Reflector Attachment
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Solution Overview
Problem
Existing backlight units for LCDs face issues with heat-induced deformation of optical members and difficult reflector attachment, leading to poor working efficiency and complex fabrication processes.
Innovation Solution
A backlight unit design featuring a heat dissipation unit between upper and lower cover plates, with a thermal pad and heat dissipation protrusion lines, and a supporting structure for easy reflector attachment, preventing heat transfer to optical members and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light source module is held by the cover plate, then the structure is simple, but heat is transferred to the optical member causing deformation
Solution Approach 1:
A heat dissipation unit is introduced as an intermediary component between the light source module and the cover plate. This heat dissipation unit includes a heat dissipation protrusion that contacts the light source module and a heat dissipation portion that extends toward the optical member, actively managing heat transfer rather than allowing passive heat conduction through the cover plate alone.
Solution Approach 2:
The cover plate is divided into a first region and a second region, with the heat dissipation unit integrated into the first region. This segmentation allows the cover plate to simultaneously perform structural support functions while delegating heat dissipation functions to the specialized heat dissipation unit, preventing heat transfer to the optical member in the second region.
2Volume of moving object
If the first reflector is attached to a narrow recessed part of the cover plate, then the assembly is compact, but attachment becomes difficult and working efficiency is poor
Solution Approach 1:
The cover plate is pre-formed with a reflector attachment protrusion that extends from the first region toward the second region. This preliminary structural preparation provides a ready-made attachment interface, eliminating the need to create narrow recessed parts during assembly and making reflector attachment straightforward while maintaining compact dimensions.
3Loss of energy
If heat dissipation is increased through better thermal conduction, then heat dissipation efficiency improves, but heat may transfer to sensitive components
Solution Approach 1:
The heat dissipation unit exhibits local quality variations: the heat dissipation protrusion portion has high thermal conduction properties to efficiently draw heat from the light source module, while the heat dissipation portion that extends toward the optical member has reduced thermal conduction capability. This spatial variation in thermal properties allows effective heat dissipation from the source while protecting sensitive components from excessive heat transfer.
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 prevents optical member deformation and facilitates easy reflector attachment, enhancing efficiency and simplifying the fabrication process while maintaining effective heat dissipation.
Implementation Method 1
a thermal pad and heat dissipation protrusion lines
Implementation Method 2
a heat dissipation unit for holding the light source and being disposed between the upper cover plate and the lower cover plate to dissipate heat from the light source
Data Source
AI summary
Embodiments relate to a backlight unit, a display device therewith, and a lighting system therewith, the backlight unit including a first reflector and a second reflector, at least one light source disposed between the first reflector and the second reflector, an upper cover plate and a lower cover plate separate from each other, and a heat dissipation unit for holding the light source and being disposed between the upper cover plate and the lower cover plate to dissipate heat from the light source.