LGP Positioning Structure Using Magnetic Attraction and Buffer Plate
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Solution Overview
Problem
The existing liquid crystal display devices using polymethylmethacrylate (PMMA) light-guiding plates (LGP) face challenges with lower impact resistance due to high thermal expansion and shrinking, which affects the precision and efficiency of light utilization from the backlight source.
Innovation Solution
A positioning structure for the LGP and back frame is introduced, featuring magnetic bodies and attachment bodies with a buffer plate to securely fix the LGP inside the back frame, utilizing magnetic attraction and buffer plates to enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If PMMA material is used for LGP to achieve high transmittance, then light transmission is improved, but anti-impact capability deteriorates due to high thermal expansion
Solution Approach 1:
A buffer plate is introduced between the LGP and the back frame to cushion thermal expansion forces before they can damage the LGP. The buffer plate absorbs the expansion stress, preventing direct impact on the fragile PMMA LGP and maintaining both its light transmission and structural integrity.
2Productivity
If LGP positioning precision is improved to enhance light utilization efficiency, then light utilization is improved, but device complexity increases due to additional positioning structures
Solution Approach 1:
Magnetic positioning bodies replace complex mechanical positioning mechanisms (such as screws, clips, or precision rails). The magnetic attraction provides sufficient holding force to secure the LGP with high precision while maintaining a simple, lightweight structure that integrates easily into the back frame.
3Stability of the object's composition
If magnetic bodies are added to secure LGP positioning, then positioning stability is improved, but device complexity increases
Solution Approach 1:
The magnetic positioning bodies are self-aligning and self-securing through magnetic attraction. The LGP automatically positions itself relative to the back frame without requiring external adjustment mechanisms, ensuring stable positioning while keeping the structure simple and easy to manufacture.
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 improves the anti-impact capability of the LGP by firmly fixing it within the back frame and buffering thermal expansion forces, enhancing the overall stability and light utilization efficiency.
Implementation Method 1
a second side inner wall adjacent to the first side inner wall being disposed with at least a first magnetic body, a side of the LGP corresponding to the second side inner wall being disposed with an attachment body corresponding to the first magnetic body; the first magnetic body and the attachment body being correspondingly attached
Implementation Method 2
the LGP has a lower anti-impact capability. In addition, during LCD displaying, the precision of the positioning of the LGP has a greater impact on the utilization efficiency for light emitted by the backlight source LED
Data Source
AI summary
The present invention provides a positioning structure for light-guiding plate (LGP) and back frame, backlight module and liquid crystal display device thereof, wherein LGP disposed inside the back frame, first side inner wall of back frame disposed with a plurality of LEDs, second side inner wall adjacent to first side inner wall disposed with first magnetic body, a side of LGP corresponding to second side inner wall disposed with attachment body; first magnetic body and attachment body correspondingly attached, third side inner wall of back frame opposite to second side inner wall disposed with buffer plate, fourth side inner wall of back frame disposed with second magnetic body, a side of LGP corresponding to fourth side inner wall disposed with attachment body; second magnetic body and attachment body correspondingly attached. As such, back frame and LGP are firmly positioned and fixed to improve assembly yield arte.