Touch Display Voltage Line Shielding Parasitic Capacitance
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Solution Overview
Problem
Touch display devices face increased thickness and manufacturing complexity due to embedded touch sensors, and performance is compromised by parasitic capacitance between touch sensors and display driving electrodes.
Innovation Solution
A touch display device design featuring touch sensors and routing lines with overlapping voltage lines to minimize manufacturing processes and reduce parasitic capacitance, using a touch sensor connecting pattern on a layer where voltage lines are disposed, allowing for improved touch sensing performance without additional manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch sensors are embedded in the display panel, then the manufacturing complexity increases, but the touch sensing performance deteriorates due to parasitic capacitance
Solution Approach 1:
The patent introduces a new spatial dimension by adding multiple voltage lines at different positions (first voltage line above the touch sensor, second voltage line below the touch sensor) to shield the touch sensor from parasitic capacitance effects. This multi-layer voltage line configuration resolves the contradiction by maintaining simple embedded sensor integration while compensating for performance degradation through additional electrostatic shielding elements.
2Length of stationary object
If touch sensors are disposed on the display panel, then the entire thickness increases, but the touch sensing performance deteriorates due to parasitic capacitance
Solution Approach 1:
The patent uses voltage lines as intermediary elements that mediate between the touch sensor and the external environment. These voltage lines act as electrostatic shields that intercept and redirect parasitic electric fields, preventing them from directly affecting the touch sensor. This intermediary approach maintains thin device profile while protecting touch sensing performance.
3Reliability
If voltage lines are disposed to overlap touch sensors, then parasitic capacitance is reduced, but the device complexity increases
Solution Approach 1:
The patent implements multi-functional voltage lines that simultaneously serve as electrostatic shields to reduce parasitic capacitance and as electrical connection pathways. By making the voltage lines perform multiple functions (shielding and connectivity), the patent reduces overall device complexity while maintaining improved touch sensing performance, as separate shielding structures would otherwise be required.
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 simplifies the manufacturing process and enhances touch sensing performance by reducing parasitic capacitance, enabling effective touch detection while maintaining display driving functionality.
Implementation Method 1
a performance of a touch sensing can drop due to a parasitic capacitance between the touch sensor and an electrode for a display driving
Data Source
AI summary
Embodiments of the present disclosure are related to a touch display device, as a touch sensor connecting pattern for a connection between touch sensors or a connection between a touch sensor and a touch routing line is disposed by using a same material with a voltage line disposed on a subpixel. Thus, an electrode structure for a touch sensing can be implemented while reducing a manufacturing process. Furthermore, as the voltage line is disposed to overlap at least a part of the touch sensor and the touch routing line, a performance of the touch sensing can be improved by reducing an influence that a parasitic capacitance by a driving of a light-emitting element affects the touch sensing.