Flexible PCB Terminal Spacing for Display Signal Integrity
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Solution Overview
Problem
Current flexible printed circuit boards in display devices have long connecting lines that result in high impedance, signal attenuation, and increased power consumption, particularly as the number of driver chip pins increases.
Innovation Solution
A flexible printed circuit board design with multiple output terminals spaced at different distances from the top end of the output portion, reducing the length of connecting lines and allowing for a more efficient electrical connection between the driver chip and the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of driver chip pins is increased, then the screen ratio can be increased, but the impedance of the connecting lines increases and signal attenuation increases
Solution Approach 1:
The patent applies local quality by varying the spacing of output terminals along the first output portion. Terminals closer to the driver chip are spaced differently from those farther away, creating non-uniform local characteristics that compensate for signal attenuation. This localized adjustment optimizes each terminal's connection quality without requiring uniform changes across the entire circuit.
Solution Approach 2:
The patent employs asymmetry by positioning output terminals at asymmetric intervals from the top end of the first output portion. Rather than uniform spacing, the asymmetric distribution allows terminals serving different pins to have optimized path lengths, balancing the electrical characteristics across all connections and reducing overall signal attenuation.
2Productivity
If the number of driver chip pins is increased, then the screen ratio can be increased, but the power consumption of connecting lines increases
Solution Approach 1:
The varied spacing of output terminals creates local quality differences that optimize current distribution. By adjusting the distance of each terminal from the top end, the patent reduces impedance in high-current paths, thereby lowering power consumption specifically in the connecting lines without affecting the overall driver chip functionality.
3Adaptability or versatility
If the connecting lines are made longer to accommodate more pins, then more pins can be connected, but the impedance of the connecting lines increases
Solution Approach 1:
The patent changes the geometric parameter of terminal spacing to optimize electrical performance. By varying the distance of each output terminal from the top end of the first output portion, the patent effectively adjusts the electrical parameters (impedance, capacitance) of each connecting line, allowing multiple pins to be connected while maintaining acceptable impedance levels.
Data Source
AI summary
A flexible printed circuit board, a display panel, and a display device are disclosed. The flexible printed circuit board includes a first input portion, and at least a first output portion disposed on the first input portion. The first input portion and the first output portion are disposed at different sides of the flexible printed circuited board. The first output portion includes a plurality of first output terminals, and each of the first output terminals of the first output portion is spaced apart at a different distance from a top end of the first output portion.