Flexible Printed Circuit Board Clock Signal Routing for Impedance Matching
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Solution Overview
Problem
The mismatch in line impedance of clock signals transmitted through flexible printed circuit boards in display apparatuses leads to chromatic aberration on display panels, affecting the display effect.
Innovation Solution
The display apparatus employs a configuration where one side of each flexible printed circuit board transmits a first group of clock signals and the opposite side transmits a second group, both groups being routed through a fan-out area to the display panel, ensuring matched line impedance between adjacent flexible printed circuit boards to suppress chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flexible printed circuit board transmits control signals through two sides with circuits, then the overall utilization rate is improved, but the line impedance of control signals is affected causing chromatic aberration
Solution Approach 1:
The flexible printed circuit board is divided into two separate sides, with each side transmitting a distinct group of clock signals. This segmentation allows independent impedance control and routing optimization for each signal group, preventing impedance mismatch and chromatic aberration while maintaining high overall utilization rate
Solution Approach 2:
Different routing configurations and impedance control measures are applied to different sides of the flexible printed circuit board according to the specific requirements of each clock signal group. This local optimization ensures that each signal group experiences appropriate impedance characteristics tailored to its transmission needs
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a display panel and a plurality of flexible printed circuit boards. The display panel has a fan-out area and a display area. The flexible printed circuit boards are coupled to the display panel. A first side of each flexible printed circuit board is configured with a plurality of first traces for transmitting a first group of clock signals among a plurality of clock signals, and a second side of each flexible printed circuit board opposite to the first side is configured with a plurality of second traces for transmitting a second group of clock signals among the clock signals. The first group of clock signals of one of the flexible printed circuit boards and the second group of clock signals of the adjacent flexible printed circuit board are transmitted to the display area through the fan-out area together.