Magnetic Alignment for Warped Light Guide Plates in Backlight Modules
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Solution Overview
Problem
The thinning structural design of light guide plates in backlight modules often leads to upward warpage, causing misalignment with light emitting diodes and resulting in light leakage and reduced efficiency, which existing solutions attempt to address with glue-based methods that complicate assembly and introduce issues like sticky problems and hotspots.
Innovation Solution
A magnetic force is generated between a first magnetic member and a second magnetic member to align the light entrance surface of the light guide device with the light source, preventing warpage by clamping the light guide device within a support frame and bottom board, eliminating the need for glue and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light guide plate is thinned structurally, then the overall device size is reduced, but upward warpage occurs at the light entrance side causing misalignment with the light emitting diode
Solution Approach 1:
The patent replaces the traditional mechanical glue-based fixation system with a magnetic field-based system. Magnets are embedded in the bottom board to generate magnetic attraction forces that hold the light guide plate flat, eliminating the need for mechanical adhesive bonding while preventing warpage in thinned light guide plates
Solution Approach 2:
The patent changes the physical state and properties of the fixation system from chemical adhesive bonding to magnetic field interaction. By adjusting magnetic field strength and distribution through magnet placement and configuration, the system achieves precise control over light guide plate positioning without the limitations of glue-based methods
2Stability of the object's composition
If glue is used to stick the bottom board to the light guide plate, then warpage is prevented, but the assembly process becomes time-consuming and strenuous
Solution Approach 1:
The patent replaces the time-consuming mechanical glue application and drying process with an instantaneous magnetic field-based fixation system. The magnets embedded in the bottom board create immediate magnetic attraction when the light guide plate is placed, eliminating the waiting time required for glue to set while maintaining stable flatness
Solution Approach 2:
The magnetic fixation system is self-aligning and self-adjusting. The magnetic field automatically positions the light guide plate correctly without requiring precise manual alignment or application skill, and the system self-regulates to maintain optimal contact pressure and flatness throughout operation
3Stability of the object's composition
If glue is used to fix the light guide plate, then warpage is prevented, but light reflection and scattering at the glue cause hotspot problems
Solution Approach 1:
The patent eliminates the glue layer entirely by using magnetic field-based fixation. This removes the source of light reflection and scattering that causes hotspot problems, while still maintaining the necessary flatness and stability of the light guide plate through magnetic attraction forces between the magnets in the bottom board and the light guide plate
Solution Approach 2:
The patent extracts and removes the glue component from the fixation system. By taking out the adhesive layer that causes optical interference, the system achieves both warpage prevention and elimination of light reflection/scattering issues through the magnetic field-based alternative
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 solution effectively prevents warpage, improves light utilization efficiency, and simplifies the assembly process by ensuring precise alignment without the complications of glue-based methods, enhancing image display quality.
Implementation Method 1
The second magnetic member is disposed corresponding to the first magnetic member to generate a magnetic force. The magnetic force attracts the first magnetic member to approach the second magnetic member for driving the light entrance surface of the light guide device to be aligned with the light source.
Data Source
AI summary
A backlight module provides light to a display panel and includes a bottom board, a support frame, first and second magnetic members, a light guide device, and a light source. The support frame is connected to the bottom board to contain the light guide device. The light source is disposed on the bottom board corresponding to a light entrance surface of the light guide device. Light of the light source is incident into the light guide device via the light entrance surface and emitted to the display panel from a light exit surface of the light guide device. The first magnetic member is disposed on the support frame or the light guide device corresponding to the light source. The second magnetic member is disposed corresponding to the first magnetic member to generate a magnetic force for driving the light entrance surface to be aligned with the light source.