Touch Panel Parasitic Capacitance Compensation via Dummy Metals
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Solution Overview
Problem
Conventional touch display devices face issues with parasitic capacitance deviations due to complex electrode patterns, leading to reduced touch sensitivity, especially when touch lines have different lengths and are arranged in active and non-active areas.
Innovation Solution
The implementation of a touch display device with a touch panel featuring mesh-patterned touch electrodes and dummy metals, where the presence and ratio of dummy metals vary to compensate for parasitic capacitance deviations, and a capacitance compensation pattern that overlaps extended touch electrodes to stabilize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch electrodes and touch lines are arranged in a touch panel to enable touch sensing, then touch input functionality is achieved, but parasitic capacitance is generated due to the electrode pattern structure
Solution Approach 1:
The patent applies local quality by making different parts of the touch electrode structure have different properties. Specifically, the touch electrode is divided into a sensing area and a non-sensing area, where only the sensing area is connected to the touch line and contributes to touch detection, while the non-sensing area is isolated and does not contribute to parasitic capacitance. This local differentiation reduces overall parasitic capacitance while maintaining touch sensing functionality.
Solution Approach 2:
The touch electrode structure is segmented into multiple independent parts: a sensing electrode portion connected to the touch line for signal transmission, and a non-sensing electrode portion isolated from the touch line. This segmentation allows the non-sensing portion to be excluded from parasitic capacitance calculations while the sensing portion maintains touch detection capability.
2Area of stationary object
If touch electrodes are arranged with different touch line lengths, then comprehensive area coverage is achieved, but deviation in parasitic capacitance occurs depending on the arrangement
Solution Approach 1:
The patent applies local quality by making different parts of the touch electrode structure have different properties. Specifically, the touch electrode is divided into a sensing area and a non-sensing area, where only the sensing area is connected to the touch line and contributes to touch detection, while the non-sensing area is isolated and does not contribute to parasitic capacitance. This local differentiation reduces overall parasitic capacitance while maintaining touch sensing functionality.
Solution Approach 2:
The patent changes the connection parameter of the touch electrode structure by selectively connecting only the sensing area to the touch line while isolating the non-sensing area. This parameter change (connection status) allows different electrode arrangements with varying touch line lengths to maintain consistent parasitic capacitance characteristics, as the isolated non-sensing area does not contribute to capacitance variations.
3Measurement precision
If complex electrode patterns are used to improve touch detection accuracy, then touch coordinate precision is enhanced, but parasitic capacitance increases due to the complicated structure
Solution Approach 1:
The patent applies local quality by making different parts of the touch electrode structure have different properties. Specifically, the touch electrode is divided into a sensing area and a non-sensing area, where only the sensing area is connected to the touch line and contributes to touch detection, while the non-sensing area is isolated and does not contribute to parasitic capacitance. This local differentiation reduces overall parasitic capacitance while maintaining touch sensing functionality.
Solution Approach 2:
The patent extracts the harmful non-sensing area from the electrode structure by isolating it from the touch line connection. The non-sensing area is physically present but electrically separated, allowing the complex electrode pattern to maintain its detection precision while the extracted non-sensing portion does not contribute to parasitic capacitance generation.
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 deviations across both active and non-active areas, enhancing touch sensitivity and stability regardless of touch line lengths and arrangements.
Implementation Method 1
a capacitance-based touch sensing method for detecting the execution or non-execution of a touch and touch coordinates based on a change in the capacitance generated in a plurality of touch electrodes formed on a touch panel
Data Source
AI summary
Disclosed is related to a touch display device and a touch panel and, more specifically, relate to a touch display device and a touch panel having a structure capable of reducing a deviation of the parasitic capacitance, which is generated in touch sensor metals, such as touch electrodes or touch lines. According to the aspects of the disclosure, it is possible to reduce a parasitic capacitance deviation, thereby improving touch sensitivity.