Flexible Printed Circuit Overlap for Display Signal Noise
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Solution Overview
Problem
The interference between flexible printed circuit boards in display devices and the increased area they occupy pose challenges in the design of flat panel displays, particularly in touch sensing applications.
Innovation Solution
The design incorporates a first and second flexible printed circuit board with specific configurations, including openings and overlapping structures, to minimize interference and reduce the occupied area, allowing for efficient signal transmission between the display panel and touch sensing layers without causing cracks or electrical noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple flexible printed circuit boards are used to transmit signals for display and touch sensing functions, then signal transmission capability is improved, but interference between the circuit boards and electrical noise increase
Solution Approach 1:
The patent transitions from a planar arrangement of flexible printed circuit boards to a three-dimensional overlapping configuration. The second FPCB is positioned to overlap the first FPCB at an angle, creating spatial separation in the vertical dimension while maintaining compact footprint. This dimensional change reduces electromagnetic interference between the circuits while preserving signal transmission functionality for both display and touch sensing operations.
Solution Approach 2:
The patent implements a nested arrangement where the second flexible printed circuit board is positioned to overlap and partially cover the first flexible printed circuit board. This nesting configuration allows both circuit boards to coexist in a limited space while minimizing their mutual interference. The overlapping structure enables the second FPCB to be effectively 'nested' within the spatial envelope of the first FPCB, reducing the overall area occupied while maintaining separate signal paths.
2Adaptability or versatility
If flexible printed circuit boards are added for touch sensing functionality, then device functionality is improved, but the area occupied by the circuit boards increases
Solution Approach 1:
The patent utilizes three-dimensional spatial arrangement to accommodate multiple flexible printed circuit boards within a reduced two-dimensional footprint. By overlapping the second FPCB onto the first FPCB at an angle, the design effectively uses the vertical dimension to pack more functionality into the same planar space, thereby reducing the overall area occupied while maintaining both display and touch sensing capabilities.
Solution Approach 2:
The nested overlapping configuration allows the second flexible printed circuit board to be positioned within the spatial envelope of the first FPCB. This nesting approach enables both circuit boards to share the same physical space without requiring additional lateral area, thus maintaining compact device dimensions while adding touch sensing functionality through the second FPCB.
Data Source
AI summary
A display device includes: a lower substrate; an upper substrate facing the lower substrate; a printed board assembly disposed on a rear surface of the lower substrate; a first flexible printed circuit board having a first end and a second end that are respectively connected to the lower substrate and the printed board assembly; and a second flexible printed circuit board having a first end and a second end that are respectively connected to the upper substrate and the printed board assembly. One of the first flexible printed circuit board and the second flexible printed circuit board has an opening at a central portion, and the other flexible printed circuit board at least partially overlaps the opening in a plane view.