Touch Display Device Parasitic Capacitance Reduction
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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
The touch display device incorporates a connection electrode with openings between signal lines and touch routing lines, and a shielding electrode insulated from the connection electrode, both electrically connected to a common electrode, to reduce parasitic capacitance and noise by preventing overlap and dispersing signal line noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal lines and touch routing lines are arranged in the non-active area, then the display can be driven and touch sensing can be performed, but parasitic capacitance is formed between the signal lines and touch routing lines which degrades touch sensing performance
Solution Approach 1:
The connection electrode is divided into multiple segments separated by openings, preventing the formation of continuous parasitic capacitance between signal lines and touch routing lines while maintaining electrical connection functionality
Solution Approach 2:
A shielding electrode is introduced as an intermediary element between the signal lines and touch routing lines. This shielding electrode acts as a mediator that blocks electromagnetic interference and reduces parasitic capacitance coupling between the signal lines and touch routing lines
2Area of stationary object
If signal lines are positioned close to touch routing lines in the non-active area, then device area is reduced, but noise in touch sensing signals increases due to parasitic capacitance
Solution Approach 1:
The shielding electrode serves as a protective intermediary that allows close positioning of signal lines and touch routing lines while blocking noise transmission. This enables area reduction without sacrificing touch sensing signal quality
Solution Approach 2:
The shielding electrode converts the potentially harmful electromagnetic field from signal lines into a beneficial effect by redirecting and containing the electric field within controlled regions, preventing it from interfering with touch routing lines
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 effectively reduces parasitic capacitance and noise in touch sensing signals, enhancing the performance and accuracy of touch sensing 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
A touch display device can include a plurality of touch electrodes disposed on an active area; a plurality of touch routing lines disposed on a non-active area positioned outside the active area and electrically connected to at least one of the plurality of touch electrodes; a plurality of signal lines disposed on an area between an area where the plurality of touch electrodes are disposed and an area where the plurality of touch routing lines are disposed; and a connection electrode disposed on a layer between a layer where the plurality of signal lines are disposed and a layer between the plurality of touch routing lines are disposed, and including at least one opening positioned on an area overlapping at least a portion of the plurality of signal lines.