Single-Layer FPC for LCD Signal Integrity
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Solution Overview
Problem
The existing flexible printed circuit boards (FPCs) in liquid crystal displays have a two-layered structure to prevent signal and power supply lines from intersecting, leading to increased manufacturing costs and signal noise due to parasitic capacitance.
Innovation Solution
A single-layered FPC structure is implemented where signal lines and power supply lines are placed on the same surface, eliminating the need for a double-layered configuration and reducing parasitic capacitance, thereby lowering manufacturing costs and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a two-layered FPC structure is used to prevent signal and power supply lines from intersecting, then signal interference is reduced, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent merges the signal lines and power supply lines onto a single layer of the FPC, eliminating the need for a two-layered structure. This is achieved by strategically routing the lines to avoid intersections, thereby simplifying the FPC structure while maintaining signal integrity and reducing manufacturing costs.
2Object-affected harmful factors
If a two-layered FPC structure is used to separate signal and power supply lines, then line intersection is avoided, but parasitic capacitance increases causing signal noise
Solution Approach 1:
The patent combines signal lines and power supply lines on the same FPC layer, routing them to avoid intersections. This approach eliminates parasitic capacitance issues associated with overlapping traces in multi-layer structures, while still preventing direct line intersections through careful path planning.
Data Source
AI summary
Provided are a circuit board and a display device having the circuit board. The circuit board includes a first surface opposite to a second surface and a first and a second wire disposed on the first surface. The circuit board is attached substantially to one side of the display panel unit.