Elastic Member Positioning for Light-Guiding Plate Warpage
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Solution Overview
Problem
The expansion and contraction of the light-guiding plate in backlight modules cause warpage, leading to imperfect optical performance and reliability issues during vibration, temperature, and humidity tests, resulting in defects like white spots, scratches, and warpage.
Innovation Solution
Incorporating elastic members between the back plate and the light-guiding plate, which include a body connected to the back plate and a positioning member that clamps the light-guiding plate to prevent warpage, using various forms such as columnar or annular protrusions to apply forces and maintain the plate's position effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a gap is provided between the back plate and the light-guiding plate to accommodate thermal expansion, then the light-guiding plate can expand without damage, but the product reliability deteriorates due to white spots, scratches, and warpage during vibration and temperature tests
Solution Approach 1:
The patent changes the physical state of the positioning mechanism from rigid to elastic. The elastic member can deform under thermal expansion forces, accommodating the light-guiding plate's dimensional changes while maintaining continuous contact and positioning. This elastic deformation capability allows the system to adapt to temperature variations without creating gaps that would cause reliability issues during vibration and humidity tests.
2Reliability
If the light-guiding plate is rigidly fixed to the back plate, then product reliability improves, but the light-guiding plate cannot expand with heat, causing warpage and damage
Solution Approach 1:
The patent transforms the static rigid connection into a dynamic elastic connection. The elastic member can dynamically adjust its deformation state based on thermal conditions - remaining relatively rigid under normal conditions to maintain positioning, but becoming more compliant when thermal expansion occurs. This dynamic behavior allows the system to maintain reliability while accommodating thermal expansion requirements.
3Device complexity
If no positioning mechanism is used, then device complexity is reduced, but the light-guiding plate cannot be positioned effectively, leading to warpage and imperfect optical performance
Solution Approach 1:
The patent employs an elastic member that functions as a flexible positioning element. This elastic component can be designed with simple geometries (such as elastic bumps or flexible clips) that provide effective positioning through elastic deformation rather than complex mechanical structures. The flexibility of the elastic member allows it to conform to the light-guiding plate while maintaining positioning precision, achieving effective clamping without excessive device complexity.
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 elastic members effectively position the light-guiding plate, preventing warpage due to thermal expansion and contraction, thereby enhancing the reliability and optical performance of the backlight module by reducing defects during testing.
Implementation Method 1
an elastic member arranged between a lateral edge of the back plate and a corresponding lateral edge of the light-guiding plate. The elastic member includes a body connected to the back plate, and a positioning member connected to the body and positioning the light-guiding plate
Data Source
AI summary
The present disclosure provides a backlight module and a display device. The backlight module includes a back plate, a light-guiding plate arranged on the back plate, and an elastic member arranged between a lateral edge of the back plate and a corresponding lateral edge of the light-guiding plate. The elastic member includes a body connected to the back plate, and a positioning member connected to the body and positioning the light-guiding plate.