Edge-Lit Backlight Heat Sink Fixing for Light Guide Plate Bending
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Solution Overview
Problem
Edge-lit backlight models in prior art fail to prevent the light guiding plate from bending due to thermal or moisture expansion, which can damage LEDs and reduce light coupling efficiency.
Innovation Solution
An edge-lit backlight design featuring a heat sink with elastic elements and back board clips that maintain the heat sink's immobility, allowing the light guiding plate to expand without increasing the light coupling distance, thereby preventing bending and ensuring efficient light coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light guiding plate is expanded to prevent bending due to thermal or moisture expansion, then the reliability is improved, but the light coupling efficiency deteriorates due to increased distance
Solution Approach 1:
The support structure is segmented into multiple back board clips distributed along the back board, each independently holding the heat sink at different positions. This segmentation allows the light guiding plate to expand freely in certain areas while maintaining support in others, resolving the contradiction between expansion space and coupling efficiency.
Solution Approach 2:
The heat sink acts as an intermediary component between the back board and the light guiding plate. By holding the heat sink through back board clips, the structure provides indirect support that allows the light guiding plate to expand without direct constraint, preventing bending while maintaining optimal coupling distance.
2Productivity
If the distance between the LED and the light guiding plate is reduced to improve light coupling efficiency, then the productivity is improved, but the reliability deteriorates due to risk of LED damage from contact during expansion
Solution Approach 1:
The back board clips are pre-installed to hold the heat sink in a fixed position before the light guiding plate undergoes thermal or moisture expansion. This preliminary positioning ensures that when expansion occurs, the light guiding plate has space to expand without contacting the LED, preventing damage while maintaining efficient coupling distance.
Solution Approach 2:
The structure provides beforehand cushioning space between the light guiding plate and the LED by positioning the heat sink through back board clips. This pre-established space acts as a buffer that prevents harmful contact during expansion while maintaining optimal coupling distance for efficient light transmission.
3Reliability
If the light guiding plate is constrained to prevent bending, then the reliability is improved, but the productivity deteriorates due to reduced expansion space affecting light coupling
Solution Approach 1:
The support structure applies local quality by using discrete back board clips at specific positions rather than continuous constraint. The clips provide localized support to prevent bending in critical areas while leaving other areas free to expand, thus maintaining both reliability and light coupling efficiency.
Solution Approach 2:
The structure embraces dynamics by allowing the light guiding plate to expand and move freely in areas not constrained by back board clips, while providing static support only where necessary to prevent bending. This dynamic approach maintains optimal coupling distance while ensuring structural reliability.
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 provides a simple fixing mechanism that allows the light guiding plate to expand without bending, preventing LED damage and maintaining efficient light coupling by keeping the light coupling distance consistent.
Implementation Method 1
an elastic element is arranged between the back board and the heat sink and the elastic element applies horizontal elastic force to the heat sink towards the back board
Implementation Method 2
when the operating environment of the edge-lit backlight model 100 is changed, especially the light guiding plate 106 is expanded for being heated or being moistened
Data Source
AI summary
The present invention relates to an edge-lit backlight model, which comprises a back board, a heat sink arranged on the back board, and a light bar fixed on the heat sink, a light guiding plate is arranged above the back board, a plurality of back board clips are arranged on the back board and the heat sink is held under the back board clips; a elastic element is arranged between the back board and the heat sink and the elastic element applies horizontal elastic force to the heat sink towards the back board, so that the heat sink is immovable along its width direction. The edge-lit backlight model can prevent the light guiding plate from being bent and guarantee the efficiency of light coupling.