Touch Sensor Trace Layout for Low-Noise Display Integration
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Solution Overview
Problem
Existing electronic devices face challenges in achieving reliable sensing due to interference between display and sensor layers, leading to reduced accuracy and efficiency in touch-based input schemes.
Innovation Solution
The electronic device incorporates a sensor layer with specific trace line configurations and signal distribution that separates sensor and display drivers, allowing for self-touch and mutual-touch schemes in different phases of the sensing frame, minimizing interference and enhancing sensing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor layer uses a conventional configuration with trace lines overlapping display signal lines, then the device structure is simpler, but noise signals are generated and sensing reliability deteriorates
Solution Approach 1:
The patent segments the trace lines into multiple groups (first trace lines, second trace lines, third trace lines) with different spatial arrangements. The first trace lines are connected to first sensing electrodes, the second trace lines to second sensing electrodes, and the third trace lines to third sensing electrodes. This segmentation allows selective activation of trace line groups during different sensing phases, preventing noise interference while maintaining sensing functionality.
Solution Approach 2:
The patent implements dynamic control of trace line activation by dividing the sensing frame into multiple sections. During the first section, only the first trace lines are activated; during the second section, the second and third trace lines are activated. This dynamic activation pattern allows the system to adaptively select trace lines based on sensing requirements, avoiding simultaneous activation that would cause noise and improving overall sensing reliability.
2Measurement precision
If driving signals are provided to all trace lines simultaneously, then the sensing coverage is complete, but noise signals are generated due to overlap with display signal lines
Solution Approach 1:
The patent segments the trace lines into distinct groups (first, second, and third trace lines) connected to different sensing electrode sets. This segmentation enables selective signal activation, allowing the system to avoid providing driving signals to trace lines that would overlap with display signal lines, thereby preventing noise generation while maintaining complete sensing coverage through coordinated activation of appropriate trace line groups.
Solution Approach 2:
The patent implements periodic activation of different trace line groups during sequential sensing frame sections. In the first section, only the first trace lines are activated; in the second section, the second and third trace lines are activated. This periodic activation pattern ensures that at any given time, only non-interfering trace lines are active, eliminating noise signals while maintaining comprehensive sensing capability through time-division multiplexing.
Data Source
AI summary
Disclosed is an electronic device including a display layer, and a sensor layer, wherein the sensor layer includes a plurality of first sensing electrodes including one end and the other end, a plurality of second sensing electrodes, a plurality of first trace lines and a plurality of second trace lines connected the plurality of first sensing electrodes, and a plurality of third trace lines connected to the plurality of second sensing electrodes, respectively, wherein the sensor layer operates in a self-touch scheme during a first section of a sensing frame, wherein a driving signal is provided only to the plurality of first trace lines and the plurality of third trace lines during the first section of the sensing frame.