Touch Panel Signal Guiding Circuit for Interference Shielding
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Solution Overview
Problem
Touch panels are susceptible to interference from static electricity and other signals, which degrades their touch-sensitivity.
Innovation Solution
A signal guiding circuit with lower impedance than the signal transmitting circuit, made of materials like copper or graphene, is placed around the touch sensing unit and signal transmitting circuit to direct external interference signals to a protection unit, which includes overvoltage protection elements, thereby reducing capacitive load and eliminating interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch panel is used, then touch functionality is provided, but the signal for determining a touch becomes susceptible to interference by static electricity or other signals which reduces the quality of the touch-sensitivity
Solution Approach 1:
A signal guiding circuit is introduced as an intermediary component between the signal transmitting circuit and external interference sources. This circuit actively guides and redirects interference signals away from the touch sensing unit, protecting the touch panel's sensitivity while maintaining its operational functionality.
Solution Approach 2:
The invention converts harmful interference signals into a beneficial protective mechanism. By providing a dedicated signal guiding circuit that attracts and redirects interference signals, the system uses the harmful static electricity and interference signals to fill the shielding circuit, thereby preventing them from reaching and damaging the touch sensing unit.
2Reliability
If shielding circuits are added around the touch sensing unit, then interference protection is improved, but device complexity increases
Solution Approach 1:
The signal guiding circuit serves multiple functions simultaneously: it acts as a shielding mechanism, an interference redirector, and a protective barrier. This multi-functionality reduces the need for separate protective components, thereby limiting the increase in device complexity while maintaining robust interference protection.
3Reliability
If the signal transmitting circuit is protected from interference, then touch-sensitivity quality is improved, but capacitive load on the driving unit increases
Solution Approach 1:
The invention extracts and isolates the interference signals from the main signal transmitting circuit by providing a separate signal guiding circuit. This extraction allows the touch sensing unit to operate with reduced capacitive load while still receiving comprehensive interference protection, as the shielding circuit handles the interference separately rather than burdening the main signaling path.
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 shields the touch panel from external interference, enhancing its sensitivity and energy efficiency by reducing capacitive load on the driving unit.
Implementation Method 1
an impedance of the signal guiding circuit is smaller than an impedance of the signal transmitting circuit
Data Source
AI summary
An electronic device includes a shell and a touch panel located in the shell. The touch panel includes a touch sensing unit, a signal transmitting circuit, a signal guiding circuit, a protection unit, and a driving unit. The signal transmitting circuit is electrically connected to the touch sensing unit and the driving unit. The signal guiding circuit surrounds the touch sensing unit and the signal transmitting circuit. The protection unit is electrically connected to the signal guiding circuit and ground. At least one switch signal is outputted from the driving unit and transmitted to the signal transmitting circuit and the signal guiding circuit. An external interference signal is received by the signal guiding circuit and guided to ground via the protection unit.