Lighting Unit Stopper Design for Thermal Stress Dispersion
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Solution Overview
Problem
Conventional lighting units for liquid crystal displays face challenges in effectively fixing the light guide plate, which can lead to damage due to thermal expansion and external impacts, compromising the structural reliability of the lighting device.
Innovation Solution
A lighting unit design featuring a support substrate with a stopper system that includes a first stopper passing through a through hole in the printed circuit board and a second stopper fixed to a bent substrate portion, allowing for stable support of the light guide plate and dispersion of thermal expansion stress, thereby preventing cracks in the light package or printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light guide plate is fixed using a conventional fixing unit, then the light guide plate can be held in position, but the light guide plate may still separate due to thermal expansion or external impact, causing damage to other components
Solution Approach 1:
The stopper is designed with a cushioning structure that absorbs and distributes the stress generated by thermal expansion of the light guide plate before it can transmit to the printed circuit board or light package. The stopper acts as a buffer element that prevents direct force transmission, thereby protecting other components from damage while maintaining the light guide plate in a fixed position.
2Stability of the object's composition
If the light guide plate is rigidly fixed to prevent movement, then positioning stability is improved, but stress concentration occurs during thermal expansion, leading to cracks in the printed circuit board or light package
Solution Approach 1:
The stopper serves as an intermediary element between the light guide plate and the printed circuit board. It provides positioning stability by preventing excessive movement of the light guide plate, while simultaneously acting as a stress-relieving mediator that distributes thermal expansion forces, preventing stress concentration and crack formation in the printed circuit board or light package.
3Reliability
If multiple stoppers are used to support the light guide plate in various directions, then stress distribution during thermal expansion is improved, but the device complexity increases
Solution Approach 1:
The fixing structure is segmented into multiple stoppers positioned at different locations and orientations around the light guide plate. Each stopper independently supports the light guide plate in specific directions, collectively providing comprehensive stress distribution capability during thermal expansion. This segmentation approach achieves reliable multi-directional support while maintaining modular simplicity in the design and manufacturing process.
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 enhances the structural reliability of the lighting unit by ensuring the light guide plate is stably supported, preventing damage from thermal expansion and external impacts, and reducing the risk of cracks in the light package or printed circuit board.
Implementation Method 1
stress generated due to thermal expansion of the light guide plate
Data Source
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AI summary
Provided is a lighting unit, including: a support substrate (140); a light guide plate (200) for guiding light generated from a light source (121); and a first stopper (130) fixed to the support substrate (140) and configured to support the light guide plate (200).