Touch Display Grounding Electrode Shields Fringe Fields
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Solution Overview
Problem
Conventional touch displays experience erroneous touch detection due to the interference of fringe electric fields, which affect the field strength at sense lines and induce incorrect results.
Innovation Solution
Incorporating a grounding electrode or grounding shield above and partially overlapping with the transmitting circuit to prevent the fringe electric field from reaching the sense lines, thereby maintaining the integrity of the normal electric field for accurate touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmitting circuit is used to send touch driving signals to drive lines, then touch detection functionality is enabled, but fringe electric fields are generated that interfere with sense lines and cause erroneous touch detection results
Solution Approach 1:
A grounding shield is introduced as an intermediary component between the transmitting circuit and the sense lines. This grounding shield acts as a mediator that captures and redirects the fringe electric fields generated by the transmitting circuit, preventing them from reaching and interfering with the sense lines, thus eliminating the harmful interference while preserving touch detection functionality
Solution Approach 2:
The grounding shield converts the harmful fringe electric fields into a beneficial effect by providing a controlled path to ground. Instead of allowing the fringe fields to randomly interfere with sense lines and cause errors, the grounding shield deliberately directs these fields to a known reference potential (ground), transforming the harmful interference into a predictable and manageable electrical phenomenon that can be accounted for in the system design
2Power
If the fringe electric field is allowed to reach the sense line, then the transmitting circuit operates with full signal strength, but the field strength at the sense line becomes affected causing incorrect touch detection results
Solution Approach 1:
The grounding shield serves as a protective intermediary that selectively blocks the fringe electric fields from reaching the sense lines while allowing the normal operating signals to pass through unaffected. This mediator maintains the full power and signal strength of the transmitting circuit by not attenuating the intended signals, while simultaneously protecting the measurement precision of the sense lines by filtering out the harmful fringe fields
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
The grounding electrode effectively shields the sense lines from fringe electric fields, enhancing the accuracy of touch detection and preventing interference, thus improving the overall performance of touch displays.
Implementation Method 1
a grounding electrode configured to electrically connect to a ground and disposed above and at least partially overlapped with the transmitting circuit
Data Source
AI summary
An electronic device and a touch display panel of the electronic device are provided. The touch display panel receives a touch driving signal and generates a sense signal in response to the touch driving signal, wherein the sense signal is analyzed to calculate a touch position on the touch display. The touch display panel includes a transmitting circuit and a grounding electrode. The transmitting circuit distributes the touch driving signal in the touch display panel. The grounding electrode is disposed over the transmitting circuit and at least partially covers the transmitting circuit, wherein the grounding electrode is a grounded conductor.