Magnetic Reflective Plate for Backlight Unit Chassis
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Solution Overview
Problem
The coupling force between the bottom chassis and the reflective plate in liquid crystal display devices is not strong enough, making it difficult and time-consuming to attach and detach them, which can lead to damage and reduced light reflectance.
Innovation Solution
A magnetic layer is introduced between the reflective layer and the bottom portion of the reflective plate, magnetically attaching it to the ferromagnetic bottom chassis, allowing for a stronger and more easily detachable coupling, with an adhesive layer and protective layer for additional stability and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a magnetic layer is added to the reflective plate to improve coupling force, then the coupling strength between the reflective plate and bottom chassis is improved, but the device complexity increases due to additional layers
Solution Approach 1:
The reflective plate is constructed as a composite structure integrating multiple functional layers: a reflective layer for light reflection, a magnetic layer for magnetic coupling with the ferromagnetic bottom chassis, an adhesive layer for bonding the reflective layer to the magnetic layer, and a protective layer for shielding the magnetic layer. This composite material approach enables the single reflective plate to simultaneously provide optical reflection and magnetic attachment functions, resolving the contradiction between improved coupling force and increased device complexity.
2Productivity
If traditional attachment methods are used, then the device complexity is low, but the attachment and detachment process is time-consuming and may cause damage
Solution Approach 1:
The patent replaces traditional mechanical attachment methods (such as screws, clips, or adhesive-only systems) with magnetic coupling. The magnetic layer in the reflective plate interacts with the ferromagnetic bottom chassis to provide strong attachment force, enabling rapid attachment and detachment without mechanical tools. This substitution eliminates the time-consuming processes and damage risks associated with traditional mechanical fastening while maintaining structural integrity.
3Force
If the magnetic layer is made thicker to increase coupling strength, then the coupling force is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the magnetic layer thickness to achieve the desired coupling force while maintaining manufacturability. Rather than using an excessively thick magnetic layer that would be difficult to manufacture, the design specifies a controlled thickness range that provides sufficient magnetic attraction between the reflective plate and bottom chassis. This parameter optimization balances coupling strength requirements with manufacturing precision capabilities, ensuring both strong attachment and feasible production.
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
This magnetic coupling reduces the time required for attachment and detachment, allows for easy reattachment, and minimizes damage to the reflective plate, while maintaining effective light reflection and distribution.
Implementation Method 1
The magnetic layer is disposed between the reflective layer and the bottom portion and magnetically attached to the bottom portion
Implementation Method 2
The bottom chassis includes a ferromagnetic material
Implementation Method 3
The reflective plate further includes an adhesive layer between the reflective layer and the magnetic layer to attach the reflective layer and the magnetic layer to each other
Implementation Method 4
The reflective layer reflects the light incident thereto
Data Source
AI summary
A backlight unit includes a bottom chassis including a bottom portion and a sidewall portion which extends from the bottom portion; a light source disposed in the bottom chassis and configured to generate and emit a light to a display panel which displays an image with the light; and a reflective plate disposed on the bottom portion of the bottom chassis and configured to reflect a portion of the light emitted by the light source toward the display panel The reflective plate includes a reflective layer configured to reflect the light incident thereto; and a magnetic layer disposed between the reflective layer and the bottom portion of the bottom chassis, and magnetically attached to the bottom portion of the bottom chassis.