LCD Backlight Cable Routing and Shutter Stability
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with unstable flexible cables and increased thickness due to the placement of backlight components, leading to potential defects and displacement of the liquid crystal shutter during assembly and impact.
Innovation Solution
The liquid crystal display device design includes cold-cathode fluorescent lamps (CCFLs) shaped like the letter L, with cables laid in a groove-like concave section of the lower mold, and a flexible cable coupled to the liquid crystal shutter, which is stored in the lower mold to maintain stability and prevent displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the liquid crystal shutter is disposed behind the liquid crystal display panel and a flexible cable is used to apply voltage, then the display device can switch between displaying images and display objects, but the flexible cable becomes unstable and may be entangled or peeled off during assembly and impact
Solution Approach 1:
The patent extracts the flexible cable from the assembly by providing a through-hole in the backlight case that allows the cable to pass through and be secured. This separates the cable management function from the main assembly body, preventing entanglement during assembly and reducing the risk of peeling off during impact, while maintaining the voltage application function to the liquid crystal shutter.
Solution Approach 2:
The patent nests the flexible cable within the backlight case structure by routing it through a dedicated through-hole and securing it with a fastening member. This nested arrangement integrates the cable into the overall structure, preventing external entanglement and providing protection against impact-induced peeling, while preserving the display mode switching functionality.
2Ease of manufacture
If cables for fluorescent lamps are laid to encircle the internal surface of the display device by creating space behind the fluorescent lamps, then the display device can be assembled, but the contour of the display device becomes large
Solution Approach 1:
The patent changes the spatial arrangement of cables by routing them along the upper surface of the backlight case in a planar configuration rather than encircling the internal surface in three-dimensional space. This dimensional change allows cables to be laid out efficiently without creating excessive contour size, while maintaining assembly feasibility through the structured cable laying path.
Solution Approach 2:
The patent applies local quality by creating a specific cable laying region on the upper surface of the backlight case with appropriate space and routing paths. This localized arrangement accommodates the cables without requiring extensive space throughout the entire device, thereby maintaining a compact contour while ensuring easy assembly and cable management.
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 design reduces the overall thickness of the display device, stabilizes the flexible cable, and prevents the liquid crystal shutter from being displaced, ensuring reliable assembly and durability against impacts.
Implementation Method 1
the liquid crystal shutter works as a diffuser for the liquid crystal display panel
Implementation Method 2
the liquid crystal shutter is then energized and thus brought to the transmissive state
Implementation Method 3
cold-cathode fluorescent lamps (CCFL) 30 and cables 31 for the CCFLs 30
Data Source
AI summary
A liquid crystal display panel is placed on an upper mold, and a liquid crystal shutter is stored in a lower mold. Fluorescent lamps serving as a light source are disposed along the internal surface of the lower mold. A display object is disposed on the back of the lower mold. Display images can be changed by switching signals to be applied to the liquid crystal shutter or liquid crystal display panel. The cables for the fluorescent lamps are laid in a groove-like concave section formed in the upper part of the lower mold. A flexible cable extended from the liquid crystal shutter is bonded to a notched portion of the upper part of the lower mold, and coupled to a printed circuit board disposed on the flank of the lower mold.