In-Cell Touch Signal Line Interference via Spacer Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-cell touch display panels face interference issues between adjacent touch signal lines due to shared connections with the printed circuit board through electrically-conductive glue, leading to signal interference.
Innovation Solution
The implementation of first and second spacers, with touch signal lines and metal lines respectively, that are mirror-symmetric and trapeziform in shape, allowing for electrical connection without direct contact during alignment, preventing signal interference by maintaining a preset distance and facilitating signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch signal lines are directly connected to the printed circuit board through electrically-conductive glue, then the connection is simple and compact, but signal interference occurs between adjacent touch signal lines
Solution Approach 1:
The patent introduces spacers as intermediary elements between the touch signal lines and the printed circuit board. These spacers create physical separation and maintain preset distances, preventing direct contact between adjacent touch signal lines while still enabling electrical connection through controlled pathways, thus eliminating signal interference without sacrificing connection simplicity
Solution Approach 2:
The patent employs spacers with mirror-symmetric trapeziform shapes that extend in the vertical dimension between the encapsulation cover plate and the printed circuit board. This dimensional approach allows the touch signal lines to be electrically connected to the printed circuit board while maintaining horizontal separation, effectively preventing signal interference through spatial arrangement
2Reliability
If spacers are introduced to prevent signal interference, then signal transmission reliability improves, but device complexity increases
Solution Approach 1:
The spacers are designed with mirror-symmetric trapeziform shapes, where the asymmetric geometry (trapezoid rather than rectangle) allows for optimized electrical connection pathways while maintaining the necessary separation. The mirror symmetry between corresponding spacers ensures consistent performance across adjacent signal lines, achieving reliable signal transmission without excessive structural complexity
Solution Approach 2:
The spacers provide localized separation only where needed between adjacent touch signal lines, rather than uniformly increasing the distance across the entire device. This targeted approach maintains signal transmission reliability in critical areas while minimizing overall structural complexity and preserving the compact design
Data Source
AI summary
Disclosed are a touch display panel, a method for fabricating the same, and a display device. Firstly first spacers are fabricated on an encapsulation cover plate, and then a pattern of touch signal lines overlying the first spacers is formed on the encapsulation cover plate, and also second spacers are formed on a substrate at positions corresponding to the first spacers, and metal lines are arranged on the second spacers to be connected with touch signal line lead lines, so that the metal lines are connected with a printed circuit board, and the touch signal lines on the first spacers come into contact with the metal lines on the second spacers while the encapsulation cover plate is being aligned with the substrate, so that the touch signal lines arranged on the encapsulation cover plate are connected with the printed circuit board arranged on the substrate.