Backlight Unit Fixing Tape T-Shape Structure FPC Lift-Off Prevention
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Solution Overview
Problem
In compact LCD devices, the lift-off phenomenon of flexible printed circuit boards (FPCs) can cause light leakage due to repulsive forces, which existing fixing methods fail to prevent effectively.
Innovation Solution
A backlight unit design featuring a fixing tape with a 'T' shape structure between light emitting diodes, where one side of the tape is attached to the FPC and the other side to the support main and light guide plate, increasing the contact area and preventing lift-off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixing tape is attached between the FPC and the support main, then the FPC is fixed in place, but the repulsive force of the FPC causes lift-off phenomenon and light leakage
Solution Approach 1:
The fixing tape is extended from a simple linear attachment to a T-shaped configuration that adds dimensional coverage. The tape not only attaches to the support main but also extends to cover the light guide plate, creating a two-dimensional fixation area that effectively counteracts the repulsive force and prevents light leakage from lifting edges.
Solution Approach 2:
The fixing structure is segmented into multiple attachment zones: one portion attaches to the support main while another portion attaches to the light guide plate. This segmentation allows the fixing tape to distribute the counteracting force across different components, effectively preventing lift-off at critical edges where light leakage would occur.
2Reliability
If the fixing tape is attached to both the support main and light guide plate, then the contact area increases and prevents lift-off, but the device complexity increases
Solution Approach 1:
The fixing tape serves multiple functions simultaneously: it provides mechanical fixation to the support main, extends coverage to the light guide plate to prevent light leakage, and maintains a relatively simple single-component structure. This multi-functionality achieves enhanced reliability without proportionally increasing 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 'T' shape structure of the fixing tape effectively prevents the lift-off of the FPC, thereby eliminating light leakage and ensuring stable fixation of the backlight unit components.
Implementation Method 1
a fixing tape configured to fix the flexible printed circuit board, the support main, and the light guide plate
Data Source
AI summary
A backlight unit preventing the lift-off of an FPC is disclosed. The backlight unit includes a plurality of light emitting diodes configured to emit light, a flexible printed circuit board on which the plurality of light emitting diodes are mounted, a light guide plate configured to be parallel to the plurality of light emitting diodes, a support main formed of a mold having a rectangular frame shape and configured to accommodate the plurality of light emitting diodes and the light guide plate, and a fixing tape configured to fix the flexible printed circuit board, the support main, and the light guide plate, wherein one side of the fixing tape is attached to the flexible printed circuit board, the other side of the fixing tape is attached to the support main and the light guide plate, and a âTâ shape structure is formed between the plurality of light emitting diodes.