Touch Screen Panel Electrode Wiring for Capacitance Uniformity
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Solution Overview
Problem
Touch screen panels face challenges in maintaining high sensing sensitivities due to variations in touch data, which can be attributed to differences in parasitic capacitance between channels, leading to inaccuracies in touch position determination.
Innovation Solution
The implementation of a touch screen panel design where first electrodes in the same column are connected to different channel wires, and the channel wiring area is divided into multiple sections to equalize the lengths of electrode wires connected to each channel wire, reducing parasitic capacitance variations and improving touch sensing characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all first electrodes in the same column are connected to the same channel wire, then the wiring structure is simple, but parasitic capacitance variations between channels increase
Solution Approach 1:
The patent segments the connection between first electrodes and channel wires by introducing intermediate second electrodes. Instead of directly connecting all first electrodes in a column to the same channel wire, the connection is divided into two stages: first electrodes connect to second electrodes, and second electrodes connect to channel wires. This segmentation allows different first electrodes to be connected to different channel wires through the same column, reducing parasitic capacitance variations while maintaining manufacturing simplicity.
2Device complexity
If electrode wires are made longer to connect more electrodes, then the number of channel wires can be reduced, but parasitic capacitance increases
Solution Approach 1:
The patent introduces second electrodes as intermediary elements between first electrodes and channel wires. These second electrodes act as mediators that redistribute the connection paths, allowing electrode wires to maintain shorter lengths while still connecting all necessary electrodes. The second electrodes enable multiple first electrodes to connect to different channel wires without requiring excessively long wire traces, thus reducing parasitic capacitance while maintaining system reliability.
3Area of stationary object
If the channel wiring area is concentrated in one location, then the layout is compact, but wire length differences between channels increase
Solution Approach 1:
The patent resolves the wire length uniformity issue by transitioning from a two-dimensional planar layout to a three-dimensional spatial arrangement. Second electrodes are positioned at different locations and heights, creating multiple connection paths that can be optimized for uniform length. This dimensional change allows the channel wiring area to remain compact while achieving consistent wire lengths by utilizing vertical and diagonal routing paths through the layered electrode structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances touch sensitivities by minimizing parasitic capacitance differences between channels, resulting in more accurate touch position determination and improved uniformity of touch data.
Implementation Method 1
capacitance values of a plurality of sensing units formed in the capacitive touch screen panel vary when a finger or a touch pen approaches or touches the capacitive touch screen panel, and thus, the occurrence of a touch and the position of the touch are sensed
Data Source
AI summary
A touch screen panel is provided. The touch screen panel includes: a sensing area comprising a plurality of first electrodes arranged in a matrix form in first and second directions of a substrate and a plurality of second electrodes extending in the first direction, the plurality of second electrodes being arranged alternately with the plurality of first electrodes in the second direction; a channel wiring area including a plurality of channel wires configured to transmit signals of the plurality of first electrodes and signals of the plurality of second electrodes, the channel wiring area being disposed around the sensing area; and an electrode wiring area comprising a plurality of electrode wires connecting the plurality of first electrodes and the plurality of second electrodes to the plurality of channel wires, the electrode wiring area being in the sensing area, wherein at least two electrodes, from among the first electrodes, that are disposed in a same column are connected to different channel wires.