Touch Layer Assembly Segmented Electrodes Reduce Capacitive Load
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Solution Overview
Problem
As display sizes increase, mutual capacitance touch technologies face issues such as high capacitive loads, noise interference, and signal attenuation, while self-capacitance touch technologies offer better performance but require innovative designs to enhance touch reporting rate and signal-to-noise ratio.
Innovation Solution
A touch layer assembly is designed with a substrate layer, effective touch lines, and sensing electrodes, featuring alternating sensing line segments and oblique connections to reduce capacitive load and noise, while maintaining a large sensing area and improving touch sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mutual capacitance touch technology is used, then touch sensing function is achieved, but capacitive load increases and noise interference worsens
Solution Approach 1:
The sensing electrode is divided into multiple sensing main lines that are further segmented into first sensing line segments (extending along the first direction) and second sensing line segments (oblique relative to the first direction). This segmentation reduces the capacitive load by breaking up continuous conductive paths and minimizes noise interference by creating discrete sensing zones.
Solution Approach 2:
The sensing line segments are arranged asymmetrically with different orientations (horizontal along first direction and oblique at angles). This asymmetric arrangement optimizes the capacitive distribution and reduces noise coupling between adjacent sensing electrodes, while maintaining effective touch sensing coverage.
2Area of stationary object
If display size increases, then display area is enlarged, but signal attenuation increases
Solution Approach 1:
The sensing electrode incorporates third sensing line segments extending in directions different from the first sensing line segments, creating a multi-dimensional sensing network. This three-dimensional arrangement of sensing lines maintains signal strength across large display areas by providing multiple signal transmission paths and reducing signal attenuation through distributed capacitance.
3Object-generated harmful factors
If self-capacitance touch technology is used, then capacitive load is reduced, but touch reporting rate and signal-to-noise ratio need enhancement
Solution Approach 1:
The sensing electrode maintains continuous capacitive coupling between adjacent sensing main lines through the oblique second sensing line segments and third sensing line segments. This continuous capacitive connection ensures uninterrupted signal transmission and enables high touch reporting rates while maintaining strong signal-to-noise ratio through sustained capacitive loading.
4Ease of manufacture
If sensing electrode structure is simplified, then manufacturing is easier, but sensing area is reduced
Solution Approach 1:
The sensing electrode structure serves multiple functions simultaneously: the first sensing line segments provide horizontal sensing paths, the second sensing line segments provide oblique cross-links, and the third sensing line segments extend sensing coverage in additional directions. This multi-functional design achieves large sensing area while maintaining relatively simple manufacturing processes.
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
The solution effectively reduces capacitive load, enhances touch reporting rate, and improves signal-to-noise ratio, addressing the limitations of mutual capacitance touch technologies and optimizing the performance of self-capacitance touch technologies.
Implementation Method 1
products adopting the self-capacitance touch technology have obvious advantages in performance such as capacitive load, touch report rate and signal-to-noise ratio
Data Source
AI summary
A touch layer assembly includes a substrate layer and effective touch lines and sensing electrodes that are disposed thereon. A sensing electrode is coupled to at least one effective touch line; the sensing electrode includes sensing main lines, each of at least one sensing main line is composed of first sensing line segments and second sensing line segments that are alternately connected; at least one sensing electrode further includes third sensing line segments connected to a sensing main line; the sensing electrodes include a first sensing electrode and a second sensing electrode that are adjacent in the first direction, and in the first sensing electrode and the second sensing electrode, a disconnected point where two sensing main lines adjacent in a same extension direction are disconnected is located on a second sensing line segment at an end of a sensing main line of the two sensing main lines.