Touch Routing Line Layout and Dummy Electrode for Parasitic Capacitance Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch display devices face performance degradation due to parasitic capacitance between signal lines and touch routing lines, which leads to noise in touch sensing signals.
Innovation Solution
Incorporating a touch dummy electrode between touch electrodes and touch routing lines, insulated from both, and applying a constant voltage to it, while ensuring touch routing lines do not overlap signal lines, and reducing the area of connection electrodes to minimize parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch routing lines are arranged in the non-active area for electrical connection to touch electrodes, then ease of manufacture is improved, but parasitic capacitance increases due to overlap with signal lines
Solution Approach 1:
The patent introduces a dummy touch electrode as an intermediate element in the spatial arrangement between the touch routing line and signal line. This dummy electrode is positioned in a different dimensional layer (on top of the signal line in the non-active area) to create vertical separation, allowing the routing line to maintain its easy manufacturable path while reducing parasitic capacitance through the intermediary shielding structure.
Solution Approach 2:
The dummy touch electrode serves as an intermediary element between the touch routing line and the signal line. It is electrically connected to a reference potential (ground or common voltage) and positioned between the routing line and signal line to shield and isolate them from each other, thereby reducing parasitic capacitance while allowing the routing line to maintain its simple layout in the non-active area.
2Measurement precision
If touch routing lines are kept away from signal lines to reduce parasitic capacitance, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The dummy touch electrode acts as a mediator that enables close proximity between touch routing lines and signal lines without direct interference. By positioning the dummy electrode between them and connecting it to reference potential, it provides electrostatic shielding that maintains measurement precision while allowing simpler routing line placement that reduces device complexity.
Solution Approach 2:
The patent changes the electrical parameter of the intermediate region by introducing a dummy electrode with controlled potential (connected to ground or common voltage). This parameter change creates an equipotential barrier that reduces capacitive coupling, allowing routing lines to be positioned closer to signal lines without degrading measurement precision, thereby simplifying the overall device structure.
3Reliability
If connection electrode area is reduced to minimize parasitic capacitance, then reliability is improved, but ease of manufacture worsens
Solution Approach 1:
The connection structure is segmented into multiple components: the touch routing line, the dummy touch electrode, and the connection electrode to the common electrode. By dividing the connection path into these segments, the patent can optimize each part's area independently - the connection electrode area is minimized to reduce parasitic capacitance and improve reliability, while the dummy electrode provides the necessary shielding function without requiring large area.
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 configuration reduces parasitic capacitance and noise in touch sensing signals, enhancing the accuracy and reliability of touch detection in touch display devices.
Implementation Method 1
the formation of parasitic capacitance between the electrodes for driving the display and the sensors for sensing a touch, which may degrade the performance of touch sensing
Data Source
AI summary
Embodiments of the present disclosure relate to a touch sensing unit and a touch display device, in which touch routing lines can be arranged so as not to overlap signal lines supplying a signal for driving a display and the area of an electrode located between the signal line and in which the touch routing line can be reduced, thereby reducing parasitic capacitance between the signal line and the touch routing line. In addition, it is possible to further reduce noise due to the signal lines and to improve the performance of touch sensing by distributing noise due to the signal lines through touch dummy electrodes positioned between the touch electrodes and the touch routing lines so as to overlap the signal lines.