Backlight Guide Protrusions for Thermal Expansion and Impact
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Solution Overview
Problem
Conventional backlight units for LCD devices face issues with thermal expansion and external impact, leading to instability and potential damage to light guide plates and light emitting diodes, which affects the reliability and performance of the display.
Innovation Solution
Incorporating guide protrusions on the substrate that contact the light guide plate, comprising a pin and a cap, to compress and fix the light guide plate, absorb thermal expansion, and protect the LEDs from external impacts, thereby enhancing the structural integrity and reliability of the backlight unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the light guide plate is fixed rigidly to the substrate, then the structural stability is improved, but the damage from thermal expansion and external impact increases
Solution Approach 1:
The patent applies beforehand cushioning by designing guide protrusions with caps that can elastically deform to absorb external impacts before they reach the light guide plate. The cap acts as a pre-positioned cushion that deforms under impact force, protecting the LED and light guide plate from damage while maintaining structural stability.
Solution Approach 2:
The patent applies parameter changes by allowing the guide protrusion cap to change its physical state from rigid to flexible under thermal expansion. The cap's material properties enable it to expand with the light guide plate during thermal cycles, converting the harmful thermal expansion into a controlled parameter change that maintains contact without causing damage.
2Reliability
If the guide protrusion height is increased to better fix the light guide plate, then the fixing reliability is improved, but the risk of LED damage from impact increases
Solution Approach 1:
The patent applies flexible shells by designing the guide protrusion cap as a flexible component that can deform elastically. The cap's flexibility allows it to maintain reliable contact with the light guide plate for positioning while absorbing impact energy through deformation, preventing direct transmission of impact forces to the LED.
Solution Approach 2:
The cap serves as a beforehand cushion that is already in place to absorb impacts. Its height is optimized to provide sufficient fixing reliability while its flexible material properties enable it to cushion impacts before they can damage the LED, resolving the contradiction between fixing strength and impact protection.
3Device complexity
If conventional fixing methods are used without guide protrusions, then the device complexity is reduced, but the reliability under thermal expansion and impact decreases
Solution Approach 1:
The guide protrusion with cap serves multiple functions simultaneously: it provides mechanical guidance for positioning the light guide plate, maintains consistent contact pressure for reliable light coupling, absorbs thermal expansion through elastic deformation, and cushions external impacts. This multi-functionality achieves high reliability without significantly increasing device complexity.
Solution Approach 2:
The invention uses parameter changes in the cap's elastic properties to achieve reliable performance under varying conditions. The cap's material parameters are selected to allow controlled deformation under thermal expansion and impact while maintaining sufficient rigidity for positioning, providing reliable performance across different operational states without complex mechanisms.
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 guide protrusions effectively maintain the light guide plate's position during thermal expansion and absorb external impacts, reducing the risk of damage to the LEDs and improving the overall reliability and stability of the backlight unit.
Implementation Method 1
the at least one guide protrusion has a height greater than a height of the light emitting diodes
Implementation Method 2
absorb thermal expansion
Implementation Method 3
compress and fix the light guide plate
Implementation Method 4
absorb external impacts, reducing the risk of damage to the LEDs
Data Source
AI summary
Provided are a lighting module, a backlight unit, and a display device including the same. The lighting module may include a substrate, a plurality of light emitting diodes positioned on a first surface of the substrate, and at least one guide protrusion on the first surface of the substrate. The at least one guide protrusion may include a pin protruding from the first surface of the substrate and a cap coupled to the pin.