Touch Antenna Array Shielding for Coupling Capacitance Control
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Solution Overview
Problem
Existing touch screen display devices face signal distortion issues due to coupling capacitance between touch wiring and feeder, which are driven at different frequencies and voltages, leading to interference and reduced performance.
Innovation Solution
Incorporating a shielding electrode with a ground voltage or constant voltage applied, positioned between the touch wiring and the feeder, to prevent signal distortion by reducing coupling capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch wiring and feeder are disposed close to each other to save space, then device area is reduced, but signal distortion increases due to coupling capacitance
Solution Approach 1:
A shielding electrode is introduced as an intermediary component between the touch wiring and the feeder. This shielding electrode acts as a mediator that blocks the electromagnetic coupling between the two conductors, thereby eliminating the harmful coupling capacitance while allowing the touch wiring and feeder to remain in close proximity for space efficiency.
Solution Approach 2:
The harmful coupling capacitance effect is extracted and neutralized by introducing the shielding electrode. The shielding electrode separates the electric field lines between touch wiring and feeder, effectively removing the parasitic capacitance that causes signal distortion while maintaining the compact layout.
2Reliability
If shielding electrode is added to reduce coupling capacitance, then signal quality is improved, but device complexity increases
Solution Approach 1:
The shielding electrode serves multiple functions simultaneously: it acts as an electromagnetic shield to block coupling capacitance, provides a reference ground plane for signal stability, and can be integrated with existing ground structures in the display device. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The shielding electrode is merged with existing ground structures or housing elements in the display device. By combining the shielding function with existing components, the design avoids adding separate dedicated shielding structures, thereby minimizing increases in device complexity while still achieving signal quality improvement.
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 shielding electrode effectively minimizes signal distortion, ensuring clear and accurate touch input and communication functions in touch screen display devices.
Implementation Method 1
signal distortion issues due to coupling capacitance between touch wiring and feeder
Implementation Method 2
Incorporating a shielding electrode with a ground voltage or constant voltage applied, positioned between the touch wiring and the feeder, to prevent signal distortion by reducing coupling capacitance
Data Source
AI summary
A display apparatus includes a display panel configured to display an image and a touch antenna array disposed on the display panel. The touch antenna array may include a touch electrode, a touch wiring electrically connected to the touch electrode, an antenna electrode including a plurality of antenna elements, a feeder electrically connected to the antenna electrode, and a shielding electrode disposed between the touch wiring and the feeder.